Why does my M340i’s check engine light come on when I start it?

It’s usually normal for your check engine light to turn on upon ignition. It’s just your M340i firing up its circuits. The dash light shouldn't stay on. If it does, you might want to bring your vehicle in for service.

Are BMW M340i engine noises bad?

Unusual noises can signal a problem with your BMW M340i engine. Tapping or knocking could mean you're low on oil. Whistling sounds could mean you have an intake leak or misaligned belt. Squealing may be caused by a loose fan belt, and grinding might be coming from the brakes, not the engine.

What could damage my BMW M340i engine?

Certain driving habits can damage your engine and should be avoided. These habits include 'running on fumes,' revving your engine while the vehicle is in Park, or pushing 'the pedal to the metal' before the engine has warmed up. Help sustain your engine’s performance and efficiency by staying miles away from these bad driving practices.

Can I put water in my BMW M340i radiator?

An emergency is the only time you should consider putting water in your radiator. Outside of that, it’s recommended you use a pre-mixed coolant or a 50/50 blend of water and coolant. However, if you need to continue driving your M340i when you’re out of coolant, having water in the coolant reservoir is better than nothing.

Why did my M340i engine suddenly stop?

Your M340i car engine could stop suddenly due to low fuel, electrical issues, overheating, a faulty ignition system, mechanical troubles, or sensor problems.

Who can repair my BMW M340i engine?

Your local Firestone Complete Auto Care fixes BMW M340i engines. Book an appointment today! We have thousands of locations across the country.

2021 BMW M340i Engine Repair

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2021 BMW M340i Trim Options

Select your BMW M340i trim level to learn more about BMW-recommended engine repair. Use the following chart to find information.

L6/3.0L

2021 BMW M340i Repair

Nothing stays the same forever. Even your BMW M340i's many parts and pieces. When something breaks, we're ready. Select a repair or category to learn more about 2021 BMW M340i services.

We’re Trained to Care for BMW M340i Engines

BMW M340i engines are known for their reliability. That might be why you bought it in the first place. However, the wear-proof engine has yet to be invented! Things can go sideways sometimes. If they do, you’ll have to find a dependable 2021 BMW service center — quick! That's when it's time to head to Firestone Complete Auto Care. We've serviced more than 500 million vehicles since 1926, and our technicians know BMW M340i engines. If you think something’s wrong with your engine, schedule an appointment at your convenience. Firestone Complete Auto Care is a top choice for professional engine diagnosis, service, and repair at an affordable price.

Check Engine Light on 2021 BMW M340i

If your M340i check engine light is on, it’s time to get it looked at. A check engine light that’s flashing or steadily illuminated could point to problems with your fuel injection, Causes may include a faulty oxygen sensor, bad spark plug, a problem with your catalytic converter, or a leaking engine vacuum, to name a few possible causes. Bring your M340i to Firestone Complete Auto Care to get computerized diagnostics and our expert techs will get the root of the problem. engine pinging noises, oil leaks, or misfiring.

2021 M340i Engine Services

If your 2021 BMW M340i needs engine repair, our technicians will provide you with a thorough explanation beforehand. We make recommendations, but you make the final decision. If a service can wait, we’ll make sure you know. We'll also tell you if it's necessary for your safety. We seek to give you all the info you need to make a smart decision about our services. By choosing Firestone Complete Auto Care for M340i engine repairs and you can drive easy knowing that we use BMW-approved parts and fluids — timing chain or belt, valve guide seal, sensors, or another part.

2021 BMW M340i Engine Q&A

Why does my M340i’s check engine light come on when I start it? It’s usually normal for your check engine light to turn on upon ignition. It’s just your M340i firing up its circuits. The dash light shouldn't stay on. If it does, you might want to bring your vehicle in for service.
Are BMW M340i engine noises bad? Unusual noises can signal a problem with your BMW M340i engine. Tapping or knocking could mean you're low on oil. Whistling sounds could mean you have an intake leak or misaligned belt. Squealing may be caused by a loose fan belt, and grinding might be coming from the brakes, not the engine.
What could damage my BMW M340i engine? Certain driving habits can damage your engine and should be avoided. These habits include 'running on fumes,' revving your engine while the vehicle is in Park, or pushing 'the pedal to the metal' before the engine has warmed up. Help sustain your engine’s performance and efficiency by staying miles away from these bad driving practices.
Can I put water in my BMW M340i radiator? An emergency is the only time you should consider putting water in your radiator. Outside of that, it’s recommended you use a pre-mixed coolant or a 50/50 blend of water and coolant. However, if you need to continue driving your M340i when you’re out of coolant, having water in the coolant reservoir is better than nothing.
Why did my M340i engine suddenly stop? Your M340i car engine could stop suddenly due to low fuel, electrical issues, overheating, a faulty ignition system, mechanical troubles, or sensor problems.
Who can repair my BMW M340i engine? Your local Firestone Complete Auto Care fixes BMW M340i engines. Book an appointment today! We have thousands of locations across the country.