Audi S5 B8.5 Won’t Start? Here’s Quick Solutions to Most Common Problems

Introduction

As a skilled mechanic with over two decades of hands on experience, I’ve helped plenty of people battling when their Audi S5 B8.5 Won’t Start. And I’ll be straight with you, not being able to start your car when you need to drive straight up sucks.

But don’t lose hope, you’ve come to the right place, no need to keep googling searches like “Audi won’t start but lights come on no clicking noise“, 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 most common causes for why your S5 B8.5 struggles to start. I’ll cover all the commonplace culprits so you can diagnose what’s happening, plus what to do to resolve each specific problem. Drawing on my two decades of firsthand experience, I’ll offer practical diagnostic pointers to get your Audi S5 B8.5 up and running as quick as possible!

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Why Won’t My an Audi Start?

Audi S5 B8.5 wont start

Before we tackle the list of possible issues and solutions, it’s vital to first gain an understanding of the core problem. When you hop in your Audi S5 B8.5 and discover “it won’t start!”, there could be a number of things causing the difficulties. Perhaps the engine doesn’t turn over whatsoever, or possibly it’s cranking but not firing. Or you might hear clicking when you try to start it, but sadly no ignition occurs. Each scenario can be a sign of various mechanical issues.

Common Reasons Why Your Audi S5 B8.5 Won’t Start

There are a host of reasons why your S5 B8.5 won’t start up. The usual suspects include a weak or drained battery, broken alternator, starter motor issues, fuel system snags, plus electrical or wiring issues. Each of these issues can show up differently, requiring specific methods of diagnosis and repair to get you driving again ASAP. All of which, we’ll delve into.

Symptoms of an Audi S5 B8.5 That Won’t Start

Recognizing these warning signs will help uncover the underlying mechanical problem. For instance, when you turn the key or press the start button and you hear it clicking but no ignition, it often indicates a fuel or ignition issue.

Analysis of The Reasons Why Your Audi S5 B8.5 Won’t Start

The initial move in fixing the no-start headache is understanding the precise cause of the issue. So let’s explore the most common explanations for the S5 B8.5 refusing to start when you turn the key.

Battery Issues in an Audi S5 B8.5

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

In the majority of cases, the most common reason an Audi S5 B8.5 won’t start comes down to battery troubles. Specifically, a drained or weak battery prevents the engine from turning over. The car’s battery delivers the required power to start the engine and run all your vehicle’s electrical components. Signals of a struggling battery entail sluggish or strained cranking, dim 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 an Audi S5 B8.5

car wont start alternator

The Alternator keeps the battery charged by using engine power while driving. A broken alternator can easily prevent your Audi S5 B8.5 from starting since it cannot recharge the battery, depleting it fully so that one day you climb into your ride and it simply can’t start. Signs of a problematic alternator may include an illuminated battery or alternator caution light on your dashboard, faint headlights while idling, or a grinding noise from the engine while running.

Starter Motor Failures in an Audi S5 B8.5

car wont start wont turn over

The starter motor is key to turning the engine when you turn the key to start your Audi. Should the starter fail, the engine might not crank, keeping your S5 B8.5 from starting. Listen for clicking noises when you turn the key or grinding as you try to start it, potentially signaling starter troubles.

Fuel System Issues in an Audi S5 B8.5

car wont start fuel filter

We’re not talking about running out of gas like a silly goose. Rather, it’s issues with the fuel system itself potentially leaving your S5 B8.5 unable to start up. Your Audi S5 B8.5 uses gas to mix with air and powers the engine. So problems here like a clogged fuel filter or damaged fuel pump relay can result in the engine lacking the fuel it requires for ignition. Fuel injectors can also get clogged over time, so consider a fuel injector cleaner like Red Line to clear any blockages and improve starting.

Electrical System or Wiring Problems in an Audi S5 B8.5

car wont start electrical issue
Image Credit: MechanicAnswer.com

Ok, well yes that image is a joke, but I want to emphasize modern vehicles rely on electronics, expanding the number of things that can go wrong. With older Audi’s, the usual suspects include blown fuses, ignition problems, damaged ignition switches, or non-working sensors. Electrical issues and electronics like these may prevent your Audi S5 B8.5 from starting. Pay attention to your car only starting sometimes, warning lights, or failure to crank as signs of an underlying electrical issue. Diagnosing and repairing these often needs a certified mechanic near you.

Solutions: Let’s Get Your Audi S5 B8.5 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 mend the problem. Here are some tips for typical issues we’ve covered thus far:

How to Identify and Fix Battery Issues in an Audi S5 B8.5

car not starting but battery is fine

The first step if a battery problem is suspected for the no start is to inspect the battery terminals. Verify they are corrosion-free, tight, and correctly connected. If the terminals are in fact dirty, try scrubbing them with a baking soda and water mixture.

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 S5 B8.5 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 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 B8.5’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 B8.5

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 vehicle running (you may need a jump start), and while the engine is running, disconnect the positive terminal of the battery. If the auto dies right quickly after that, it’s likely a bad alternator. Keep in mind though this test can be dangerous and damage delicate electronics in your motor, so seeking advice from a trained 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 B8.5. You find all the information you need about your specific vehicle by searching online for something like “Audi vin lookup owner free“, 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 B8.5

starter motor issues in a ford

If you wonder if the starter motor is the source of your S5 B8.5 failing to start up, listen carefully for a clicking sound when you turn the ignition key. If present, but the engine does not turn over, the starter motor likely requires 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 B8.5

clogged fuel filter car wont start

If you think a fuel system malfunction might be causing the no-start, listen closely for the fuel pump noise when you flip the key to “on” before attempting to start the car. The pump should make a faint humming for a few seconds. If such a noise is not heard, the fuel pump could be faulty. Difficult starting, stalling, or poor throttle response may also come from a clogged fuel filter. Filter and pump issues normally require a skilled mechanic to inspect and repair them properly, often involving fuel pressure testing and specialized diagnostic gear. Later in this article, I detail the best ways to get help from a local Audi mechanic near you. 

How to Fix Electrical or Wiring Issues in an Audi S5 B8.5

fuses to check when car wont start

If you think it’s an electrical circuitry issue, first examine the fuses for the ignition system, and swap out any that have blown. If your S5 B8.5 starts after this, it was a successful, inexpensive repair! But if your Audi S5 B8.5 refuses to start, even sometimes, the ignition switch itself could be the cause of the issue. Warning lights on the dashboard could additionally mean a damaged component. These can be complex problems needing a qualified mechanic to diagnose and fix (see below advice on local mechanics).

How to Prevent Starting Issues in an Audi S5 B8.5

As dad used to say: “An ounce of prevention is worth a pound of cure”. Here’s how to avoid future troubles starting your S5 B8.5:

Routine Maintenance of Your Audi S5 B8.5

Regular maintenance on car to prevent starting issues

Regular maintenance is essential to avoiding issues, including oil changes, battery checks, cleaning terminals, replacing the fuel filter as needed, and having a mechanic inspect the car routinely. If confused about maintenance for your model, consult a mechanic locally or online for clarification.

Drive Your S5 B8.5 Frequently

drive regular to avoid car troubles

If your Audi S5 B8.5 happens to sit motionless in the garage or driveway for too long without being driven, the battery can reduce as it is not being recharged by the engine running, through the alternator. Try your best to drive your Audi S5 B8.5 regularly to maintain a charged battery. If you remember you have not driven your car in a while, take it for a brief 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.

Take Notice Of Warning Signs

Check Engine Control Light on a Vehicle Dashboard

If you notice any irregular 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.

Benefits 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 B8.5 that’s having issues or an Audi S7 4G 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 explain the issues you’re having, ask Audi mechanics endless questions, and even upload pics and videos so you can demonstrate to the mechanic what you mean. You can chat with them via instant messenger or phone call, whatever you like. The Audi specialist will diagnose the problem, advise the best fix for your specific situation, and even guide you on 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 Audi mechanic advice service and see for yourself!

When and How to Get a Local Audi Mechanics Help

automobile mobile mechanic

When your Audi S5 B8.5 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 B8.5 started again ASAP.

So if you think a mobile mechanic is the best solution for you, instead of searching on Google something like  “home visit mechanic“, 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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Conclusion

In short, when your Audi S5 B8.5 won’t start, it can be a total bummer. However, grasping what might be triggering the problems, being able to diagnose them, and knowing what steps are required in each case, and where to get help if necessary, will be a huge help. Keep in mind that routine maintenance is key to avoiding most car problems.

Frequently Asked Questions (FAQs) When a Audi S5 B8.5 Won’t Start

Audi S5 B8.5 won’t start but lights come on?

If your Audi S5 B8.5‘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 engine starter. Investigate if you hear any clicking noises when trying to turn 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 fixed or swapped out.

Audi S5 B8.5 won’t start but has power?

When your Audi S5 B8.5 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. Listen near 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 B8.5 won’t start but battery is fine?

If your Audi S5 B8.5‘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 accurately identify the specific electrical fault and have it repaired.

Audi S5 B8.5 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 physical fixing or swapping out, seek help from a reliable mechanic to get your Audi S5 B8.5 running again.

What if my Audi S5 B8.5 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 will talk about here. If you still can’t pinpoint the exact issue, you’ll have to consult a trusted Audi mechanic locally or online.

Determine if my Audi S5 B8.5 won’t start because of a bad battery?

Clues that your Audi’s battery is the issue include, a slow cranking engine, dim front lights, and battery alerts lighting up on the dash. You can also make sure the battery terminals are clean, corrosion-free, and tightly fastened. If your battery is older it’s probably best to just replace it completely.

How to prevent my Audi S5 B8.5 from failing to start in the future?

To prevent this nuisance from reoccuring, regular upkeep is vital. This includes oil changes, testing the battery and cleaning its terminals, changing out the fuel filter when necessary, and getting your Audi S5 B8.5 evaluated 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 Audi S5 B8.5 fails to start up?

Yes, you can. An online mechanic service like ours can offer instant skilled Audi mechanic aid and suggestions, without you having to leave your house. If your vehicle fails to start and is immobile in the parking area, this is particularly beneficial.

How can platforms like MechanicAnswer.com be of service if my Audi S5 B8.5 isn’t starting?

We link you with licensed Audi specialists who can supply proposals tailored to your exact predicament. You can brief them about your auto troubles, ask unlimited questions as needed, upload images and videos so you can fully detail the issue. The mechanic will be able to help, identify the issue, and propose the best solution and guide you through it.

Interesting Audi S5 B8.5 Facts

Did you know that the Audi S5 B8.5 comes with a supercharged 3.0-liter V6 engine that produces a whopping 333 horsepower? That’s enough power to go from 0 to 60 miles per hour in just 4.9 seconds! And get this – the S5 B8.5 also comes with Audi’s legendary Quattro all-wheel drive system, giving you the confidence to tackle any road or weather condition. But here’s the really cool part – the S5 B8.5 also features a sport differential that can send up to 85% of the power to the rear wheels, giving you a thrilling and dynamic driving experience. It’s no wonder why the Audi S5 B8.5 is such a beloved and sought-after sports car. So if you’re currently dealing with a non-starting S5 B8.5, just remember all the incredible performance and technology that makes it so special – and maybe give it a little pep talk to get it going again!

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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