Mercedes S-klasse AMG Wont Start? Here’s Quick Solutions to Most Common Problems

Intro

As a trained auto mechanic with over two decades of hands on experience, I’ve seen plenty of people battling when their Mercedes S-klasse AMG Won’t Start. And I’ll be straight with you, not being able to start your car when you need to drive is incredibly bothersome.

But keep your chin up, you’ve come to the right place, no need to keep googling searches like “Mercedes isn’t starting“, I got you covered. My name’s Robby, a certified auto mechanic with over two decades of experience, and in this article, I’ll walk you through the usual causes for why your S-klasse AMG struggles to start. I’ll detail all the typical culprits so you can identify what’s happening, plus what to do to fix each specific situation. Drawing on my 20 years of training and on the job experience, I’ll provide actionable repair advice to get your Mercedes S-klasse AMG up and running as quick as possible!

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Why Won’t My a Mercedes Start?

Mercedes S-klasse AMG wont start

Before we dive into the laundry list of possible issues and solutions, it’s vital to first get on the same page of the central issue. When you hop in your Mercedes S-klasse AMG and discover “it won’t start!”, there could be multiple components causing the troubles. Maybe the engine isn’t cranking at all, or maybe it’s cranking but not firing. Or you might notice clicking sounds when you try to start it, but sadly no ignition occurs. Each scenario can be a sign of different mechanical issues.

Common Reasons Why Your Mercedes S-klasse AMG Won’t Start

There are numerous contributing factors why your S-klasse AMG won’t start. Typical causes cover a weak or drained battery, broken alternator, starter motor issues, fuel system problems, plus electrical or wiring defects. Each of these issues can show up differently, needing specific methods of diagnosis and repair to get you back on the open road ASAP. All of which, we’ll delve into.

Symptoms of a Mercedes S-klasse AMG That Won’t Start

Recognizing these warning signs will lead you to the underlying issue. For instance, when you turn the key or press the start button and you hear it turning over yet no start up, it often indicates a fuel or ignition issue.

Analysis of The Reasons Why Your Mercedes S-klasse AMG Won’t Start

The first step in fixing the no-start headache is understanding the exact origin of the trouble. So let’s take a closer look at the most common explanations for the S-klasse AMG refusing to start when you turn the key.

Battery Issues in a Mercedes S-klasse AMG

car wont start but battery is good
Image Credit: MechanicAnswer.com

In the vast majority of situations, the most common reason a Mercedes S-klasse AMG won’t start comes down to battery troubles. Specifically, a weak or dead battery prevents the engine from turning over. The car’s battery provides the required power to start the engine and activate all your vehicle’s electrical components. Signs of a dying battery entail sluggish or strained cranking, faint headlights, or a battery alert symbol aglow on the dash. A battery charger can recharge a drained battery if you don’t have the help of another vehicle to jump start it, but do have an electrical socket nearby like at home.  And a portable jump starter lets you charge p the battery without another vehicle, and by the roadside without the need for an electrical socket, so you are never stuck.

Alternator Problems in a Mercedes S-klasse AMG

car wont start alternator

The Alternator keeps the battery juiced up by using engine power while driving. A worn out alternator can easily stop your Mercedes S-klasse AMG from starting since it cannot recharge the battery, depleting it fully so that one day you hop in your beloved Mercedes S-klasse AMG and it just can’t start. Symptoms of a wonky alternator can be a lit up battery or alternator warning symbol on the dashboard, dim headlights while idling, or a grinding noise from the engine while running.

Starter Motor Failures in a Mercedes S-klasse AMG

car wont start wont turn over

The starter motor is key to cranking the engine when you go to start up your Mercedes. In the event of starter problems, the engine may fail to crank, keeping your S-klasse AMG from starting. Be on the alert for clicking noises when you turn the key or grinding as you try to start it, possibly meaning starter troubles.

Fuel System Issues in a Mercedes S-klasse AMG

car wont start fuel filter

This isn’t about running out of gas like a silly goose. Instead, it’s issues with the fuel system itself potentially leaving your S-klasse AMG unable to start. Your Mercedes S-klasse AMG uses fuel to combine with oxygen and powers the engine. Issues in fuel delivery like a clogged fuel filter or damaged fuel pump relay may mean the engine is unable to get the fuel it needs to start. Fuel injectors can also get clogged over time, so try a fuel injector cleaner like Red Line to clean them out and improve starting.

Electrical System or Wiring Problems in a Mercedes S-klasse AMG

car wont start electrical issue
Image Credit: MechanicAnswer.com

Ok, well yes that image is a joke, but I want to emphasize today’s cars depend greatly on electronics, expanding the number of things that can go wrong. Even in older vehicles, the usual suspects include blown fuses, ignition problems, faulty ignition switches, or non-working sensors. Faulty wiring and electronics like these can all prevent your Mercedes S-klasse AMG from starting. Be on the lookout for your car only starting sometimes, warning lights, or failure to crank as hints of an underlying electrical issue. Diagnosing and repairing these typically requires a certified mechanic near you.

Solutions: Let’s Get Your Mercedes S-klasse AMG Starting Again!

If you think you might know what the issue may be, it’s time to figure out the cause of your car’s failure to start, and then the logical next move is to attempt to mend the problem. Here’s advice for the frequent problems we’ve talked about already:

How to Identify and Fix Battery Issues in a Mercedes S-klasse AMG

car not starting but battery is fine

If you believe a battery issue is to blame for your Mercedes’s difficulty turning on, first check the battery terminals Make sure they are corrosion-free, tight, and properly connected. If the terminals are in fact corroded, try cleaning them with a sodium bicarbonate(baking soda) and water solution.

Once you have checked the battery terminals, you can check to see if the battery is just out of charge, or worse, it’s old and weak, or dead and needs to be replaced. For this, you can charge the battery in a few different ways:

If the battery charges fully and performs as expected, the issue may be resolved. However, if the battery has aged or lacks capacity, replacing it will be necessary. Otherwise, even sufficiently charging it to start your S-klasse AMG may only provide temporary relief before it likely runs out of power again soon. Using a multimeter or OB2 scanner to evaluate the battery’s condition can determine if it’s worth preserving or requires replacement. Suitable replacement batteries for your specific Mercedes can be found on Amazon here by entering your vehicle details to filter for the right fit and choosing a highly-rated seller.

Robby Recommends:

Portable Car Battery Jump Starter Charger - NOCO Boost Plus GB40

At Home Battery Charger - YONHAN - Fully Automatic

Jumper Cables by Energizer for Car Battery - Heavy Duty

NOCO Boost Plus GB40 1000A UltraSafe Car Battery Jump Starter

YONHAN Battery Charger Fully-Automatic

Energizer Jumper Cables for Car Battery, Heavy Duty

If charging your S-klasse AMG’s battery fails to solve ongoing issues like frequent draining and recharging even after installing a new battery, an underlying problem likely causes the excessive drain. Professional diagnostic services would then be needed to inspect and identify the root cause. You can also consult a mechanic online through us or obtain an instant quote from a mobile mechanic.

How to Identify and Fix Alternator Problems in a Mercedes S-klasse AMG

Car wont start replace alternator needed

If you think the alternator is the reason your Mercedes S-klasse AMG won’t start, a test can confirm. If you can temporarily get the vehicle running (you may need a jump start), with the engine on, disconnect the positive battery terminal. If the auto dies right quickly after that, it’s likely a bad alternator. Keep in mind though this test can be risky and mess up sensitive electronics in your motor, so it’s best to talk to an experienced mechanic locally or online first since this test risks harming the delicate electronic gizmos in your car.

If you figure out that the alternator is the problem, it’s a case of having it replaced. I recommend consulting an online or local mechanic as they will advise you on how difficult the repair is for your specific model, and you can work out if you want to try it yourself, or with the advice of an online mechanic

If you do want to try it yourself or take it to a local garage, you can often buy the replacement parts yourself cheaper than at the garage, but you need to know what to get for your model of Mercedes S-klasse AMG. You find all the information you need about your specific vehicle by searching online for something like “free Mercedes accident report by vin“, which is a purchasable report, that will give the specs for your vehicle and which parts are compatible, and then you can go get the alternator parts you need. However, an easier option is, Amazon probably has the alternator you need online, at a cheaper price, and their site easily shows which ones will go in your specific car model. Check the Amazon alternator page here

How to Identify and Fix Starter Motor Problems in a Mercedes S-klasse AMG

starter motor issues in a ford

If you suspect the starter motor is the culprit behind your Mercedes not starting, be alert for a clicking sound when you turn the key. If heard, but the engine does not turn over, the starter motor likely requires replacing. You can take it to a local garage and have them repair it, or repair it yourself with the help and advice from an online mechanic guiding you. 

If you need it, one of the cheapest and easiest places to get a new starter motor, for your exact vehicle model is on the Amazon here.

How to Identify and Solve Fuel System Problems in a Mercedes S-klasse AMG

clogged fuel filter car wont start

If you think a fuel system malfunction might be causing the no-start, tune your ears for the fuel pump hum when you flip the key to “on” before trying to turn over the car. The pump should make a faint humming for a few seconds. If you can’t hear that noise, the fuel pump could be defective. Difficult starting, stalling, or lagging acceleration may also stem from a problematic or clogged fuel filter. Filter and pump issues normally need a skilled mechanic to inspect and repair them properly, often using fuel pressure testing and precise diagnostic equipment. Later in this article, I detail the best ways to get help from a local Mercedes mechanic near you. 

How to Repair Electrical or Wiring Problems in a Mercedes S-klasse AMG

fuses to check when car wont start

If you suspect it’s an wiring issue, first examine the fuses for the ignition system, and replace any that have blown. If your S-klasse AMG starts after this, it was a successful, inexpensive fix! But if your Mercedes S-klasse AMG refuses to start, even sometimes, the ignition switch itself could be the cause of the issue. Dash lights on the dashboard could also mean a faulty component. These can be intricate issues needing a professional mechanic to diagnose and fix (see below advice on local mechanics).

How to Prevent Starting Issues in a Mercedes S-klasse AMG

As dad would say: “An ounce of prevention is worth a pound of cure”. Here’s how to avoid future troubles starting your S-klasse AMG:

Routine Maintenance of Your Mercedes S-klasse AMG

Regular maintenance on car to prevent starting issues

Routine maintenance is essential to avoiding issues, including oil changes, checking the battery, cleaning terminals, replacing the fuel filter as needed, and having a mechanic check over the vehicle routinely. If unsure about maintenance for your model, ask a mechanic locally or online for clarification.

Drive Your S-klasse AMG Frequently

drive regular to avoid car troubles

If your Mercedes S-klasse AMG happens to sit parked in your garage or driveway for weeks without being driven, the battery can decrease as it is not being recharged by the engine running, through the alternator. Try your best to drive your Mercedes S-klasse AMG regularly to keep a charged battery. If you remember you haven’t driven your car in a while, take it for a quick spin around town to ensure there is still a charge left.

Note: Letting the battery entirely drain is also bad for its longevity, so try to avoid that.

Take Notice Of Warning Signs

Check Engine Control Light on a Vehicle Dashboard

If you notice any abnormal things like unusual noises, changes in driving and performance, or warning lights lit up on the dashboard, do not ignore them. These are often early signs of an issue that should be addressed ASAP before they escalate into larger problems later on. Consult with a mechanic locally or online about these problems and get advice on if they require attention.

When to Ask a Mercedes Mechanic Online

If your schedule is packed, or you gave fixing the no start yourself an honest effort but with no luck, consider consulting a Mercedes mechanic online. It delivers quick professional advice from the comfort of home, and is far less expensive than a tow and diagnosis at the local garage.

Benefits of an Online Mercedes Mechanic

Happy mechanic repairing car looking at camera

By detailing what you’ve already tried and sharing specifics on the no-start issue, online mechanics can then offer a custom action plan to help get your car started again. With so many Mercedes mechanics available they can help fix nearly any problem, it doesn’t if matter it’s your S-klasse AMG that’s having issues or a Mercedes S-Class won’t start, the online mechanics can help sort anything in no time. And with many household budgets tighter these days, the convenience and affordability of online mechanics help, keep your wallet happy too.

You can describe the issues you’re having, ask Mercedes mechanics unlimited questions, and even upload images and videos so you can demonstrate to the expert what you mean. You can chat with them via instant messenger or voice chat, whichever you prefer. The Mercedes mechanic will ID the issue, recommend the best fix for your specific case, and even guide you on basic repairs step-by-step.

Whether you want an expert second opinion or are simply short on time, online repairs assistance is there when you need it. Give it a try to see firsthand how convenient fixing problems can be.

So feel free to try out our chat with a Mercedes mechanic free service and see for yourself!

When and How to Get a Local Mercedes Mechanics Help

automobile mobile mechanic

When your Mercedes S-klasse AMG won’t start, and you are unable to repair it yourself, thinking about how to get your vehicle to the garage can be a nightmare. There are options like roadside services, that come to you and can provide simple fixes to get your car moving enough again, so you can get it to a mechanic garage for proper repairs. You can also use a towing service, but these can be costly, easily into the hundreds of dollars. A much better option is the use of a mobile mechanic, who will come to you at your home, place of work, or by the roadside, and carry out repairs there and then for you, so you can get your S-klasse AMG started again ASAP.

So if you think a mobile mechanic is the best solution for you, instead of searching on Google something like  “mobile auto repair“, the best in the USA that also covers most towns is YourMechanicI have personally recommended them to countless people across the country and they always have a great experience.

Reasons I recommend them:

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If you would like to know more, the process to use them is this.

  1. Visit their official website here: YourMechanic
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Super easy, super reliable, super convenient, and highly recommended.

Conclusion

In short, when your Mercedes S-klasse AMG won’t start, it can be a major inconvenience. However, grasping what might be triggering the problems, being able to diagnose them, and knowing what steps are needed in each case, and where to get help if needed, will be a huge help. Remember that regular maintenance is vital to avoiding most car problems.

Frequently Asked Questions (FAQs) When a Mercedes S-klasse AMG Won’t Start

Mercedes S-klasse AMG won’t start but lights turn on?

If your Mercedes S-klasse AMG‘s lights turn on but it still won’t start, the issue may not be related to the battery. It’s highly possible there is a problem with the starter motor. Investigate if you hear any clicking noises when attempting to crank the key. If so, the starter motor is attempting to activate but failing. Have a mechanic examine the starter motor – it may need to be repaired or replaced.

Mercedes S-klasse AMG won’t start but has power?

When your Mercedes S-klasse AMG has power (lights, radio etc work) but fails to start, there may be a fuel delivery problem. Issues like a faulty fuel pump relay could stop fuel getting to the engine. Without enough fuel, combustion can’t happen and the engine won’t start. Listen near the back seat when cranking the key – you should hear the fuel pump prime for a few seconds. If not, have a mechanic check the fuel system.

Mercedes S-klasse AMG won’t start but battery is good?

If your Mercedes S-klasse AMG‘s battery checks out OK and is fully charged, but the car still refuses to start, the underlying cause is likely electrical. Potential culprits include a bad ignition switch, broken sensor, or wiring problems. As electrical issues can be tricky, diagnosis by a professional mechanic is best. They can correctly pinpoint the specific electrical fault and have it repaired.

Mercedes S-klasse AMG won’t start just clicking?

When you turn the key and there’s only a clicking noise but the engine doesn’t crank, the most common cause is a faulty starter motor. The click comes from the starter solenoid trying to engage the starter motor, but the motor itself fails to crank the engine. As the starter motor needs mechanical repair or replacing, seek help from a reliable mechanic to get your Mercedes S-klasse AMG running again.

What if my Mercedes S-klasse AMG won’t start up?

First things first, take a deep breath and don’t panic. Check for any odd noises, flashing lights, or changes in how it runs that could point to the issue. Chances are the culprit is one of the common problems we’ll talk about here. If you still can’t pinpoint the exact issue, you’ll have to ask for help from a trusted Mercedes mechanic locally or online.

Determine if my Mercedes S-klasse AMG won’t start because of a bad battery?

Signs that your Mercedes’s battery is the issue are, a slow cranking engine, dim headlights, and battery alerts lighting up on the dash. Also check that the battery terminals are clean, corrosion-free, and tightly fastened. If your battery is older it’s probably best to just replace it entirely.

How to prevent my Mercedes S-klasse AMG from failing to start in the future?

To prevent this hassle from reoccuring, regular maintenance is crucial. This includes oil changes, inspecting the battery and scrubbing its terminals, changing out the fuel filter when required, and getting your Mercedes S-klasse AMG checked out by a mechanic routinely. Additionally, make sure to drive the car frequently so the battery stays charged.

Can I consult an online mechanic if my Mercedes S-klasse AMG fails to start up?

Yes, you can. An online mechanic service like ours can offer instant skilled Mercedes mechanic help and suggestions, without you having to leave your house. If your vehicle fails to start and is immobile in the driveway, this is particularly useful.

How can services like MechanicAnswer.com lend a hand if my Mercedes S-klasse AMG doesn’t ignite?

We pair you with licensed Mercedes technicians who can supply recommendations particular to your exact situation. You can inform them about your vehicle troubles, ask as many questions as needed, and even submit images and videos so you can fully detail the issue. The specialist auto mechanic will be able to assist, identify the fault, and propose the ideal solution and walk you through it.

Interesting Mercedes S-klasse AMG Facts

Did you know that the Mercedes S-klasse AMG has a top speed of 186 mph? That’s faster than a cheetah! And get this, it can go from 0 to 60 mph in just 3.5 seconds. It’s like a rocket on wheels! And if you’re into high-tech features, this car has got you covered. It comes with a Burmester 3D surround sound system that will make you feel like you’re in the front row of a concert. Plus, the interior is decked out with ambient lighting that can change to match your mood. And here’s a fun fact: the S-klasse AMG has a semi-autonomous driving system that can actually steer, accelerate, and brake for you in certain situations. It’s like having your own personal chauffeur! So, if you’re feeling down about your car trouble, just remember all the amazing things your Mercedes S-klasse AMG can do. It’s a real powerhouse of a car!

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  1. Chat with an Online Mechanic to get instant, unlimited help and advice for 1 full week, for just $5.
  2. Get in-person help from a Mobile Mechanic Near You. They will come to you and fix your vehicle at a time that suits you. If there are none near you, you will be redirected to the online mechanic.

Which Mechanic Suits You?

  1. Chat with an Online Mechanic to get instant, unlimited help and advice for 1 full week, for just £5.
  2. Get help from a Mobile Mechanic. We  recommend Fixter. They will come to you and fix your vehicle at a time that suits you. Instant free quote online below. We recommend the online mechanic first, as it’s cheaper for you, and you may not need an in-person mechanic.

Which Mechanic Suits You?

  1. Chat with an Online Mechanic to get instant, unlimited help and advice for 1 full week, for just $5.
  2. Get in-person help from a Mobile Mechanic. We recommend YourMechanic. They will come to you and fix your vehicle at a time that suits you. Instant free quote online below. We recommend the online mechanic first, as it’s cheaper, and you may not need an in-person mechanic.

Choose Your Mechanic

1. Chat with A.I. Mechanic (Robot Robby)
  • Free 7-day trial
  • A.I. Mechanic that is trained by our human mechanic writers. As helpful as a human mechanic for expert advice, troubleshooting, and repair guidance.
2. Chat with a Human Mechanic Online
  • Join for just $5, and $39/month. Cancel anytime
  • Real human ASE-certified mechanics available 24/7

Which Mechanic Suits You?

  1. Chat with an Online Mechanic to get instant, unlimited help and advice for 1 full week, for just $5.
  2. Get in-person help from a Mobile Mechanic Near You. They will come to you and fix your vehicle at a time that suits you. If there are none near you, you will be redirected to the online mechanic.

Which Mechanic Suits You?

  1. Chat with an Online Mechanic to get instant, unlimited help and advice for 1 full week, for just £5.
  2. Get help from a Mobile Mechanic. We  recommend Fixter. They will come to you and fix your vehicle at a time that suits you. Instant free quote online below. We recommend the online mechanic first, as it’s cheaper for you, and you may not need an in-person mechanic.

Which Mechanic Suits You?

  1. Chat with an Online Mechanic to get instant, unlimited help and advice for 1 full week, for just $5.
  2. Get in-person help from a Mobile Mechanic. We recommend YourMechanic. They will come to you and fix your vehicle at a time that suits you. Instant free quote online below. We recommend the online mechanic first, as it’s cheaper, and you may not need an in-person mechanic.

Where Can I Find My VIN?

Your vehicle’s unique Vehicle Identification Number (VIN) can be found on the title document, the vehicle registration, and the insurance policy. It is a series letters and numbers like this as example: WAUGC0896JA235262. The VIN can also be located on the following locations on the vehicle itself:

how to find VIN on vehicle