BMW 4 Series Wont Start? Here’s Quick Solutions to Most Common Problems

BMW 4 Series

Intro

As a trained mechanic with over two decades of hands on experience, I’ve seen plenty of people struggling when their BMW 4 Series Won’t Start. And to be frank, 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 “my BMW wont start in the cold and it’s not the battery“, I got you covered. My name’s Robby, a certified auto mechanic with over two decades of experience, and in this guide, I’ll outline the usual reasons for why your 4 Series fails to start. I’ll cover all the commonplace suspects so you can pinpoint what’s causing issues, plus what to do to fix each particular situation. Drawing on my 20 years of training and on the job experience, I’ll offer actionable diagnostic pointers to get your BMW 4 Series up and running as quick as possible!

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So Why Won’t My a BMW Start?

BMW 4 Series wont start

Before we tackle the list of possible issues and solutions, it’s vital to first get on the same page of the central issue. When you climb into your BMW 4 Series and discover “it won’t start!”, there could be a number of parts causing the troubles. Perhaps the engine doesn’t turn over whatsoever, or maybe it’s turning over partially yet not igniting. Or you might hear clicking when you try to start it, but ultimately nothing happens. Each scenario can indicate various mechanical issues.

Common Reasons Why Your BMW 4 Series Won’t Start

There are many reasons why your 4 Series won’t fire up. Typical causes cover a dead or weak battery, faulty alternator, starter motor complications, fuel system problems, plus electrical or wiring defects. Every one of these issues can show up differently, needing specific methods of diagnosis and repair to get you driving again pronto. All of which, we’ll delve into.

Symptoms of a BMW 4 Series That Won’t Start

Spotting these red flags will guide you toward the underlying mechanical problem. Take for example, when you turn the key or press the start button and you hear it clicking but no ignition, it often signifies a problem with either fuel delivery or ignition issues.

Analysis of The Reasons Why Your BMW 4 Series Won’t Start

The initial move in remedying the no-start hassle is identifying the precise origin of the trouble. So let’s examine the most common causes of the 4 Series struggling to start when you turn the key.

Car Battery Issues Preventing Your BMW 4 Series From Starting

Car wont start battery is good

In the vast majority of situations, the most common reason a BMW 4 Series won’t start comes down to battery troubles. Specifically, a weak or dead battery prevents the engine from turning over. The car’s battery supplies the required power to ignite the engine and activate all your electronics. Signs of a struggling battery entail sluggish or strained cranking, dim headlights, or a warning light illuminated 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 Can Prevent Your BMW 4 Series Starting

car wont start alternator

The Alternator keeps the battery juiced up by harnessing engine power while driving. A broken alternator can easily prevent your BMW 4 Series from starting since it cannot recharge the battery, depleting it fully so that one day you climb into your wheels and it just can’t start. Signs of a problematic alternator may include a lit up battery or alternator warning symbol on the dash, faint headlights while idling, or a grinding noise from the engine while running.

Starter Motor Failures in a BMW 4 Series

car wont start wont turn over

The starter is crucial for cranking the engine when you try and start up your BMW. In the event of starter problems, the engine may fail to crank, keeping your 4 Series from starting. Listen for clicking noises when you turn the key or grinding during cranking, potentially signaling starter issues.

Fuel System Issues Can Prevent a BMW 4 Series From Starting

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 that could leave your 4 Series unable to start. Your car uses gas uses gas to mix with air and powers the engine. So problems here like a clogged fuel filter or failing fuel pump relay can result in the engine lacking 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 BMW 4 Series Can Prevent it From Starting

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 the number of things that can go wrong. Even in older models, the usual suspects include blown fuses, ignition problems, broken ignition switches, or broken sensors. Faulty wiring and electronics like these may prevent your car from starting. Watch for intermittent starting, warning lights, or failure to crank as indicators pointing to an underlying electrical problem. Pinpointing and fixing these typically requires a qualified mechanic near you.

Solutions: Let’s Get Your BMW 4 Series 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 next step is to try to repair the issue. Here’s advice for the frequent problems we’ve talked about already:

How to Identify and Fix Battery Issues in a BMW 4 Series

car not starting but battery is fine

The first step if a battery problem is suspected for the no start is to have a look at the battery terminals. Ensure they are corrosion-free, tight, and correctly connected. If the terminals are in fact corroded, try scrubbing them with a sodium bicarbonate(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, replacing the battery will be required if it is old, weak or dead. Otherwise, even sufficiently charging it to start your 4 Series 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 replacement. Suitable replacement batteries for your specific BMW 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 4 Series’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 BMW 4 Series

Car wont start replace alternator needed

If you suspect the alternator is causing your ride to have issues starting, you can test it yourself. If you can temporarily get the auto running (you may need a jump start), and while it’s running, disconnect the positive terminal of the battery. If the auto dies pretty quickly after that, it’s likely a bad alternator. Keep in mind though this test can be dicey and mess up delicate electronics in your wheels, so it’s best to talk to a professional mechanic locally or online first since this test risks damaging the delicate electronics in your auto.

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 BMW 4 Series. You find all the information you need about your specific vehicle by searching online for something like “BMW best free VIN check“, 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 BMW 4 Series

starter motor issues in a ford

If you think the starter motor is the reason behind your BMW not turning over, be alert for a clicking sound when you turn the 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 a BMW 4 Series

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 flip the key to “on” before attempting to start the car. The pump should emit 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 blocked fuel filter. Both pump and filter issues usually need a professional mechanic to diagnose and fix 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 BMW mechanic near you. 

How to Fix Electrical or Wiring Issues in a BMW 4 Series

fuses to check when car wont start

If you suspect it’s an electrical problem, first examine the fuses for the ignition system, and replace any that have blown. If your 4 Series starts after this, it was a successful, inexpensive repair! But if your BMW 4 Series refuses to start, even sometimes, the ignition switch itself could be problematic. Warning lights on the dashboard could additionally mean a damaged component. These can be intricate issues needing a professional mechanic to diagnose and properly repair (see below advice on local mechanics).

Preventive Steps

As grandad would say: “An ounce of prevention is worth a pound of cure”. Here’s how to avoid future troubles starting your 4 Series:

Regular Maintenance of Your BMW 4 Series

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 check over the vehicle routinely. If confused about maintenance for your model, consult a mechanic locally or online for guidance.

Drive Your 4 Series Frequently

drive regular to avoid car troubles

If your BMW 4 Series happens to sit motionless in the garage or driveway for too long without being driven, the battery can weaken as it is not being charged up by the engine running, through the alternator. Try your best to drive your vehicle regularly to maintain a charged battery. If you remember you haven’t 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 fully 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 irregular 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 a BMW 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 a BMW 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.

Advantages of an Online BMW 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 BMW mechanics available they can help fix nearly any problem, it doesn’t if matter it’s your 4 Series that’s having issues or a BMW 3 Series wont 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 issues you’re having, ask BMW mechanics unlimited questions, and even submit pics and videos so you can show the mechanic what you mean. You can connect with them via online chat or phone call, whichever you prefer. The BMW specialist will diagnose the problem, recommend the best fix for your particular case, and even walk you through simple repairs step-by-step.

If you’re seeking reassurance from a certified mechanic before purchasing expensive parts, or just pressed for time – online assistance has real benefits. Give it a try – you may be surprised just how easy and stress-free it is.

So feel free to try out our BMW repair answers service and see for yourself!

When and How to Get a Local BMW Mechanics Help

automobile mobile mechanic

When your BMW 4 Series 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 4 Series started again ASAP.

So if you think a mobile mechanic is the best solution for you, instead of searching on Google something like  “ask a mechanic free chat“, 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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  • You see the price upfront, no surprises or hidden fees
  • Low Cost compared to regular garages

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
  3. Book a time and place for the mechanic to come to you
  4. The mechanic will arrive in a fully stocked repair van and repair it right in front of you
  5. Pay when the job is completed.

Super easy, super reliable, super convenient, and highly recommended.

Conclusion

In short, when your BMW 4 Series doesn’t turn over, it can be a total bummer. However, understanding 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 regular maintenance is key to preventing most vehicle problems.

Frequently Asked Questions (FAQs)

What if my BMW 4 Series won’t start up?

First things first, take a deep breath and don’t panic. Look 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 locate the exact issue, you’ll have to ask for help from a trusted BMW mechanic locally or online.

Determine if my BMW 4 Series won’t start because of a bad battery?

Clues that your BMW’s battery is the issue include, a slow cranking engine, dim front lights, and battery warning symbols lighting up on the dash. 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 BMW 4 Series from failing to start in the future?

To prevent this frustration from repeating, routine upkeep is crucial. This includes oil changes, checking the battery and cleaning its terminals, replacing the fuel filter when required, and getting your BMW 4 Series inspected by a mechanic frequently. Additionally, be diligent about drive the car regularly so the battery stays charged.

Can I consult an online mechanic if my BMW 4 Series fails to start up?

Yes, you can. An online mechanic service like ours can offer immediate expert BMW mechanic help and recommendations, without you having to leave your residence. {If your vehicle fails to start and is stuck in the driveway, this is especially beneficial.

How can services like MechanicAnswer.com provide assistance if my BMW 4 Series isn’t starting?

We connect you with licensed BMW specialists who can provide proposals specific to your exact predicament. You can inform them about your auto issues, ask as many questions as needed, upload videos or pictures so you can fully detail the issue. The mechanic will be capable to aid, diagnose the issue, and put forward the ideal remedy and guide you through it.

Interesting BMW 4 Series Facts

Did you know that the BMW 4 Series comes with an optional feature called the “Air Breather”? It’s not some kind of scuba gear for your car, but rather a sleek design element that channels air from the front wheel arches, reducing aerodynamic drag and improving fuel efficiency. And get this – the BMW 4 Series also has an available “Cerium Grey” trim package, which adds a touch of sophistication with its unique metallic finish. Plus, the 4 Series offers a variety of engine options, including a powerful inline-6 that can propel you from 0 to 60 in just over 4 seconds. How’s that for a cool ride? So even if your 4 Series is currently giving you trouble, just remember all the awesome features that make it such a standout vehicle!

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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