Audi S5 B9 Won’t Start? Here’s Quick Solutions to Most Common Problems

Intro

As a qualified car mechanic with over two decades of hands on experience, I’ve helped plenty of people struggling when their Audi S5 B9 Won’t Start. And let’s be honest, not being able to start your car when you need to drive is incredibly bothersome.

But don’t worry, you’ve come to the right place, no need to keep googling searches like “when a Audi doesn’t start“, I got you covered. My name’s Robby, a certified auto mechanic with over two decades of experience, and in this guide, I’ll explain the usual causes for why your S5 B9 struggles to start. I’ll detail all the typical suspects so you can pinpoint what’s happening, plus what to do to resolve each particular problem. Drawing on my 20 years of personal experience, I’ll supply actionable troubleshooting tips to get your Audi S5 B9 starting again as quick as possible!

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Why Won’t My an Audi Start?

Audi S5 B9 wont start

Before we dive into the laundry list of possible faults and fixes, it’s critical to first gain an understanding of the central issue. When you hop in your Audi S5 B9 and realize “it won’t start!”, there could be multiple components causing the troubles. Perhaps the engine doesn’t turn over whatsoever, or maybe it’s cranking but not firing. Or you might hear clicking when you try to start it, but ultimately nothing happens. Each scenario can be a sign of different problems under the hood.

Common Reasons Why Your Audi S5 B9 Won’t Start

There are a host of culprits as to why your S5 B9 won’t start. The usual suspects cover a dead or weak battery, faulty alternator, starter motor complications, fuel system problems, plus electrical or wiring issues. Each of these issues can show up differently, needing specific methods of troubleshooting and fixing to get you driving again ASAP. All of which, we’ll delve into.

Symptoms of an Audi S5 B9 That Won’t Start

Spotting these red flags will guide you toward the underlying issue. For instance, when you turn the key and you hear it turning over yet no start up, it often signifies a fuel or ignition issue.

Analysis of The Reasons Why Your Audi S5 B9 Won’t Start

The first step in remedying the no-start headache is identifying the specific origin of the issue. So let’s explore the most frequent causes of the S5 B9 refusing to start when you turn the key.

Battery Issues in an Audi S5 B9

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

In the majority of cases, the most common reason an Audi S5 B9 won’t start comes down to battery troubles. Specifically, a drained or weak battery prevents the engine from cranking. The car’s battery supplies the necessary electrical juice to ignite the engine and energize all your electronics. Signs of a struggling battery entail labored or difficult cranking, dim headlights, or a battery alert symbol aglow 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 B9

car wont start alternator

The Alternator keeps the battery charged by using engine power while driving. A worn out alternator can easily prevent your Audi S5 B9 from starting since it fails to recharge the battery, depleting it completely so that one day you hop in your ride and it just can’t start. Symptoms of a wonky alternator may include an illuminated battery or alternator caution light on the dash, faint headlights while idling, or a whirring noise from the engine while running.

Starter Motor Failures in an Audi S5 B9

car wont start wont turn over

The starter is crucial for turning over the engine when you try and start up your Audi. In the event of starter problems, the engine might not crank, keeping your S5 B9 from starting. Listen out for clicking noises when you turn the key or grinding during cranking, possibly meaning starter troubles.

Fuel System Issues in an Audi S5 B9

car wont start fuel filter

This isn’t about running out of gas like a silly goose. Rather, it’s problems in the fuel system itself that could leave your S5 B9 unable to drive. Your car uses gas uses gas to combine with oxygen and powers the engine. Issues in fuel delivery 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 clear any blockages and improve starting.

Electrical System or Wiring Problems in an Audi S5 B9

car wont start electrical issue
Image Credit: MechanicAnswer.com

Ok, well yes that image is a joke, but I want to emphasize modern cars now rely heavily on electronics, increasing what can go wrong. With older cars, common culprits include blown fuses, ignition problems, broken ignition switches, or broken sensors. Electrical issues and electronics like these can all prevent your Audi S5 B9 from starting. Pay attention to intermittent starting, dashboard alerts, or failure to crank as signs of an underlying electrical issue. Pinpointing and fixing these typically requires a knowledgeable mechanic near you.

Solutions: Let’s Get Your Audi S5 B9 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 starting failure, and then the next step is to try to mend the problem. Here’s advice for the typical problems we’ve discussed up to this point:

How to Identify and Fix Battery Issues in an Audi S5 B9

car not starting but battery is fine

If you think a battery issue is to blame for your Audi’s difficulty starting, first examine the battery terminals Make sure they are clean, secure, and correctly connected. If the terminals are in fact corroded, try scrubbing 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, replacing the battery will be required if it is aged, dead or lacks capacity. Otherwise, even sufficiently charging it to start your S5 B9 may only provide temporary relief before it runs out of charge again in the near future. 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 B9’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 B9

Car wont start replace alternator needed

If you think the alternator is the reason your vehicle won’t start, a test can confirm. If you can temporarily get the car running (you may need a jump start), and while it’s running, disconnect the positive terminal of the battery. It’s probably the alternator if the engine dies soon after disconnecting the positive lead. Keep in mind though this test can be dangerous and harm sensitive electronics in your wheels, so consulting a qualified mechanic locally or online is best prior to trying it.

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 B9. You find all the information you need about your specific vehicle by searching online for something like “vin lookup Audi“, 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 B9

starter motor issues in a ford

If you think the starter motor might be causing your Audi S5 B9 to not start up, listen closely for a clicking sound when you turn the ignition key. If present, but the engine does not turn over, the starter motor likely requires replacement. 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 B9

clogged fuel filter car wont start

If you think a fuel system issue might be to blame for the no-start, tune your ears for the fuel pump hum when you turn the key to “on” before attempting to start the car. The pump should make a quiet humming for a few seconds. If you can’t hear that noise, the fuel pump could be defective. Problematic starting, stalling, or poor throttle response may also stem from a problematic or clogged fuel filter. Both pump and filter issues normally require a professional mechanic to diagnose and fix them properly, often using fuel pressure testing and precise diagnostic gear. 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 B9

fuses to check when car wont start

If you think it’s an wiring problem, first check the fuses for the ignition system, and replace any that have blown. If your S5 B9 starts after this, it was an effective, cheap 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 faulty component. These can be complex problems needing a professional mechanic to identify and properly repair (see below advice on local mechanics).

How to Prevent Starting Issues in an Audi S5 B9

As grandfather used to say: “An ounce of prevention is worth a pound of cure”. Here’s how to prevent future problems starting your S5 B9:

Regular Upkeep of Your Audi S5 B9

Regular maintenance on car to prevent starting issues

Routine 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 regularly. If unsure about maintenance for your model, ask a mechanic locally or online for clarification.

Drive Your S5 B9 Regularly

drive regular to avoid car troubles

If your Audi S5 B9 happens to sit motionless in your garage or front yard for too long without being driven, the battery can deplete as it is not being recharged by the engine running, through the alternator. Try your best to use your car regularly to keep a charged battery. If you remember you have not driven your car in a while, take it for a brief spin around town to ensure there is still a charge left.

Note: Letting the battery completely 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 weird things like unusual sounds, 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 you have limited time available, or you gave fixing the no start yourself an honest effort but with no luck, consider consulting an Audi mechanic online. It delivers quick professional advice from the comfort of your living room, and is far less expensive than a tow and diagnosis at the local garage.

Benefits of an Online Audi 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 Audi mechanics available they can help fix nearly any problem, it doesn’t if matter it’s your S5 B9 that’s having issues or an Audi TT RS 8S 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 explain the problems you’re having, ask Audi mechanics unlimited questions, and even upload pics and videos so you can demonstrate to the mechanic what you mean. You can connect with them via online chat or phone call, whatever you like. The Audi specialist will diagnose the problem, advise the top solution for your specific situation, and even guide you on simple 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 to see firsthand how convenient fixing problems can be.

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

When and How to Get a Local Audi Mechanics Help

automobile mobile mechanic

When your Audi S5 B9 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 B9 started again ASAP.

So if you think a mobile mechanic is the best solution for you, instead of searching on Google something like  “mobile mechanic that comes 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:

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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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Conclusion

In short, when your Audi S5 B9 doesn’t turn over, it can be a total bummer. However, grasping what might be causing the issues, being able to diagnose them, and knowing what steps are required in each case, and where to get help if needed, will be a huge help. Keep in mind that routine care is vital to avoiding most car issues.

Frequently Asked Questions (FAQs) When a Audi S5 B9 Won’t Start

Audi S5 B9 won’t start but lights turn on?

If your Audi S5 B9‘s lights illuminate but it still won’t start, the issue is likely not related to the battery. It’s highly possible there is a problem with the engine starter. Check to see if you hear any clicking sounds when attempting to crank the key. If so, the starter motor is attempting to activate but failing. Get a mechanic check over the starter motor – it may need to be repaired or replaced.

Audi S5 B9 won’t start but has power?

When your Audi S5 B9 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 prevent 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.

Audi S5 B9 won’t start but battery is good?

If your Audi S5 B9‘s battery tests fine 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.

Audi S5 B9 won’t start just clicking?

When you turn the key and just hear clicking 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 spin up the engine. As the starter motor needs mechanical repair or replacing, seek help from a reliable mechanic to get your Audi S5 B9 running again.

What if my Audi S5 B9 won’t start up?

First things first, take a deep breath and try to stay calm. 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 pinpoint the exact issue, you’ll have to ask for help from a trusted Audi mechanic locally or online.

How do I know if my Audi S5 B9 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. You can also check that the battery terminals are clean, corrosion-free, and tightly fastened. If your battery is exhausted it’s probably best to just replace it entirely.

How to prevent my Audi S5 B9 from failing to start in the future?

To prevent this frustration from reoccuring, regular maintenance is essential. This includes oil changes, inspecting the battery and cleaning its terminals, replacing the fuel filter when necessary, and getting your Audi S5 B9 checked out by a mechanic routinely. Additionally, remember to drive the car often so the battery stays charged.

Can I consult an online mechanic if my Audi S5 B9 fails to start up?

Yes, you can. An online mechanic service like ours can offer immediate skilled Audi mechanic help and advice, without you having to leave your home. If your vehicle fails to start and is immobile in the driveway, this is particularly helpful.

In what ways can services like MechanicAnswer.com be of service if my Audi S5 B9 doesn’t ignite?

We connect you with qualified Audi technicians who can offer suggestions specific to your unique situation. You can brief them about your auto troubles, ask as many questions as needed, and even submit images and videos so you can show in detail the problem. The specialist auto mechanic will be capable to help, pinpoint the issue, and recommend the ideal remedy and talk you through it.

Interesting Audi S5 B9 Facts

Did you know that the Audi S5 B9 comes with a turbocharged 3.0-liter V6 engine that produces a whopping 354 horsepower and 369 lb-ft of torque? That means this sleek and stylish car can go from 0 to 60 mph in just 4.4 seconds, making it a true powerhouse on the road. But it’s not just about speed – the S5 B9 also comes with Audi’s Quattro all-wheel drive system, ensuring maximum traction and control in all kinds of driving conditions. And let’s not forget about the stunning design, with its aggressive front grille, sleek lines, and signature LED headlights. It’s no wonder the Audi S5 B9 is a showstopper on the road. So if you’re lucky enough to own one, you’re in for a thrilling ride every time you hit the road.

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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