Audi S5 B8 Won’t Start? Here’s Quick Solutions to Most Common Problems

Green Audi S5

Intro

As a certified auto mechanic with over 20 years of hands on experience, I’ve helped plenty of people battling when their Audi S5 B8 Won’t Start. And I’ll be straight with you, not being able to start your car when you need to drive is extremely bothersome.

But don’t lose hope, you’ve come to the right place, no need to keep googling searches like “where is the starter in my Audi“, I got you covered. My name’s Robby, a certified auto mechanic with over two decades of experience, and in this article, I’ll explain the usual explanations for why your S5 B8 can’t start. I’ll detail all the typical offenders so you can diagnose what’s happening, plus what to do to resolve each particular situation. Drawing on my two decades of personal experience, I’ll provide usable diagnostic pointers to get your Audi S5 B8 up and running as soon as possible!

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Why Won’t My an Audi Start?

Audi S5 B8 wont start

Before we tackle the list of possible faults and fixes, it’s vital to first gain an understanding of the central issue. When you climb into your Audi S5 B8 and discover “it won’t start!”, there could be several parts causing the headaches. Maybe the engine doesn’t turn over whatsoever, or possibly it’s turning over partially yet not igniting. Or you might hear clicking when you try to start it, but sadly no ignition occurs. Each scenario can signal different problems under the hood.

Common Reasons Why Your Audi S5 B8 Won’t Start

There are numerous contributing factors why your S5 B8 won’t turn on. Typical causes cover a weak or drained battery, broken alternator, starter motor complications, fuel system snags, plus electrical or wiring issues. Every one of these concerns can present differently, requiring specific methods of diagnosis and repair to get you back on the open road as quick as possible. All of which, we’ll delve into.

Symptoms of an Audi S5 B8 That Won’t Start

Identifying these warning signs will lead you to the main mechanical problem. For instance, when you turn the key or press the start button and you hear it clicking but no ignition, it often means a problem with either fuel delivery or ignition issues.

Analysis of The Reasons Why Your Audi S5 B8 Won’t Start

The first step in solving the no-start hassle is identifying the exact cause of the problem. So let’s examine the most frequent explanations for the S5 B8 struggling to start when you turn the key.

Battery Issues in an Audi S5 B8

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

In the majority of cases, the most frequent reason an Audi S5 B8 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 energize all your vehicle’s electrical components. Signals of a dying battery include sluggish or strained cranking, dim headlights, or a warning light illuminated on the dash. A battery charger can recharge a dead 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 an Audi S5 B8

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 Audi S5 B8 from starting since it fails to recharge the battery, draining it fully so that one day you climb into your beloved Audi S5 B8 and it just can’t start. Signs of a malfunctioning alternator may include an illuminated battery or alternator warning symbol on its dash, dull headlights while idling, or a whirring noise from the engine while running.

Starter Motor Failures in an Audi S5 B8

car wont start wont turn over

The starter motor is key to cranking the engine when you turn the key to start your Audi. In the event of starter problems, the engine can’t crank, preventing your S5 B8 from starting. Listen out for clicking noises when you turn the key or grinding while trying to start, possibly meaning starter troubles.

Fuel System Issues in an Audi S5 B8

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 S5 B8 unable to start up. Your car uses gas uses fuel to combine with oxygen and powers the engine. So problems here like a clogged fuel filter or failing fuel pump relay may mean the engine lacking the fuel it requires for ignition. 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 an Audi S5 B8

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, opening up the number of things that can go wrong. Even in older cars, the usual suspects include blown fuses, spark issues, damaged ignition switches, or non-working sensors. Electrical issues and electronics like these may prevent your vehicle from starting. Watch for intermittent starting, warning lights, or failure to crank as signs of an underlying electrical issue. Pinpointing and fixing these typically requires a qualified mechanic near you.

Solutions: Let’s Get Your Audi S5 B8 Starting Again!

If you think you might know what the issue may be, it’s time to figure out the reason behind your car’s inability to start up, and then the next step is to try to fix the issue. Here’s advice for the typical issues we’ve covered thus far:

How to Identify and Fix Battery Issues in an Audi S5 B8

car not starting but battery is fine

If you think a battery issue is to blame for your Audi’s trouble turning on, first inspect the battery terminals Verify they are corrosion-free, secure, and correctly connected. Should you find corrosion on the terminals, a baking soda and water solution can help clean them.

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, replacing the battery will be required if it is old, weak or dead. Otherwise, even sufficiently charging it to start your S5 B8 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 swapping out. Suitable replacement batteries for your specific Audi 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 S5 B8’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 an Audi S5 B8

Car wont start replace alternator needed

If you think the alternator is the reason your Audi S5 B8 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 car dies right quickly after that, it’s likely a bad alternator. Keep in mind though this test can be risky and damage sensitive electronics in your ride, so it’s best to consult with a pro mechanic locally or online first since this test risks harming the delicate electronics in your Audivehicle.

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 Audi S5 B8. You find all the information you need about your specific vehicle by searching online for something like “free Audi vin owner lookup“, 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 an Audi S5 B8

starter motor issues in a ford

If you think the starter motor might be causing your Audi S5 B8 to not fire up, listen closely for a clicking sound when you turn the ignition key. If heard, but the engine does not turn over, the starter motor likely needs replaced. 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 an Audi S5 B8

clogged fuel filter car wont start

If you think a fuel system malfunction might be to blame for the no-start, listen closely for the fuel pump hum when you turn the key to “on” before attempting to start the car. The pump should emit a quiet humming for a few seconds. If such a noise is not heard, the fuel pump could be defective. Problematic starting, stalling, or poor throttle response may also come from a clogged fuel filter. Filter and pump issues usually need a professional mechanic to inspect and repair them properly, often involving fuel pressure testing and specialized diagnostic equipment. Later in this article, I detail the best ways to get help from a local Audi mechanic near you. 

How to Repair Electrical or Wiring Problems in an Audi S5 B8

fuses to check when car wont start

If you think it’s an wiring issue, first inspect the fuses for the ignition system, and swap out any that have blown. If your S5 B8 starts after this, it was a successful, inexpensive fix! However, if it still won’t start, even sometimes, the ignition switch itself could be faulty. Warning lights on the dashboard could additionally mean a damaged sensor. These can be complex issues needing a qualified mechanic to diagnose and properly repair (see below advice on local mechanics).

How to Prevent Starting Issues in an Audi S5 B8

As grandad would say: “An ounce of prevention is worth a pound of cure”. Here’s how to prevent future problems starting your S5 B8:

Routine Maintenance of Your Audi S5 B8

Regular maintenance on car to prevent starting issues

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

Drive Your S5 B8 Frequently

drive regular to avoid car troubles

If your Audi S5 B8 happens to sit unmoved in your garage or driveway for too long without being driven, the battery can weaken as it is not being recharged by the engine running, through the alternator. Try your best to drive your vehicle regularly to keep a charged battery. If you remember you have not driven your car in a while, take it for a quick drive around town to ensure there is still a charge left.

Note: Letting the battery completely run out of charge is also bad for its longevity, so try to avoid that.

Pay Attention to Warning Signs

Check Engine Control Light on a Vehicle Dashboard

If you notice any weird 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 an Audi Mechanic Online

If your schedule is packed, or despite putting in real effort on your own, you still can’t get your car to start, consider consulting an Audi 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.

Advantages of an Online Audi Mechanic

Happy mechanic repairing car looking at camera

Online Audi mechanics can review your symptoms, past repair history, and circumstances to provide troubleshooting steps tailored to your situation. With so many Audi mechanics available they can help fix nearly any problem, it doesn’t if matter it’s your S5 B8 that’s having issues or an Audi S8 D3 won’t start, the online mechanics can help sort anything in no time. And with many household budgets tighter these days, an online mechanic provides instant affordable help when you need it most, 24/7.

You can describe the issues you’re having, ask Audi mechanics unlimited questions, and even upload photos and videos so you can demonstrate to the mechanic what you mean. You can talk to them via instant messenger or phone call, whichever you prefer. The Audi mechanic will diagnose the problem, recommend the top solution for your specific case, and even walk you through basic maintenance 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 – you may be surprised just how easy and stress-free it is.

So feel free to try out our free Audi mechanic chat service and see for yourself!

When and How to Get a Local Audi Mechanics Help

automobile mobile mechanic

When your Audi S5 B8 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 S5 B8 started again ASAP.

So if you think a mobile mechanic is the best solution for you, instead of searching on Google something like  “auto mechanic come to your house“, 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:

  • They use experienced ASE-certified mechanics
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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
  2. Get an instant free quote for what you need
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Conclusion

In short, when your Audi S5 B8 doesn’t turn over, it can be a major inconvenience. However, grasping what might be triggering the issues, being able to diagnose them, and knowing what actions are needed in each case, and where to find help if necessary, will be a huge help. Remember that regular maintenance is vital to avoiding most car problems.

Frequently Asked Questions (FAQs) When a Audi S5 B8 Won’t Start

Audi S5 B8 won’t start but lights turn on?

If your Audi S5 B8‘s lights illuminate 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. Check to see if you hear any clicking noises when trying to turn the key. If so, the starter motor is trying to engage but failing. Get a mechanic examine the starter motor – it may need to be fixed or swapped out.

Audi S5 B8 won’t start but has power?

When your Audi S5 B8 has power (lights, radio etc work) but does not start up, 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. Check around the back seat when turning the key – you should hear the fuel pump prime for a few seconds. If not, have a mechanic check the fuel system.

Audi S5 B8 won’t start but battery is fine?

If your Audi S5 B8‘s battery tests fine and is fully charged, but the car still refuses to start, the underlying cause is likely electrical. Possible issues 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.

Audi S5 B8 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 attempting to activate 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 Audi S5 B8 running again.

What if my Audi S5 B8 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. Most likely the culprit is one of the common problems we’ll talk about here. If you still can’t identify the exact issue, you’ll have to consult a trusted Audi mechanic locally or online.

Determine if my Audi S5 B8 won’t start because of a bad battery?

Signs that your Audi’s battery is the issue are, a slow cranking engine, dim front lights, and battery alerts lighting up on the dash. Also make sure the battery terminals are clean, corrosion-free, and tightly fastened. If your battery is worn out it’s probably best to just replace it entirely.

How to prevent my Audi S5 B8 from failing to start in the future?

To prevent this nuisance from repeating, regular servicing is crucial. This includes oil changes, inspecting the battery and scrubbing its terminals, replacing the fuel filter when necessary, and getting your Audi S5 B8 inspected by a mechanic frequently. Also, be diligent about drive the car frequently so the battery stays charged.

Can I consult an online mechanic if my Audi S5 B8 fails to start up?

Yes, you can. An online mechanic service like ours can offer instant professional Audi mechanic assistance and suggestions, without you having to leave your house. This is particularly useful if your Audi S5 B8 is unable to start and is stuck in the parking area,.

In what ways can websites like MechanicAnswer.com be of service if my Audi S5 B8 isn’t starting?

We connect you with qualified Audi technicians who can offer recommendations particular to your unique predicament. You can update them about your auto issues, ask as many questions as needed, and even submit images and videos so you can comprehensively demonstrate the issue. The mechanic will be able to help, pinpoint the fault, and propose the best solution and walk you through it.

Interesting Audi S5 B8 Facts

Did you know that the Audi S5 B8 is equipped with a supercharged 3.0-liter V6 engine that produces a whopping 333 horsepower and 325 lb-ft of torque? That’s enough power to go from 0 to 60 mph in just 4.9 seconds! And get this – the S5 B8 also features Audi’s legendary Quattro all-wheel drive system, providing incredible traction and handling in any driving conditions. Plus, with its sleek and stylish exterior design, luxurious interior, and advanced technology features, it’s no wonder the S5 B8 is a favorite among car enthusiasts. So, if you’re currently unable to get your S5 B8 started, don’t worry – once you do, you’ll be in for an exhilarating ride that’s sure to put a smile on your face!

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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