Why does the check engine light in my 840i turn on when I start my car?

Generally, your check engine light turning on upon ignition is not a bad thing. It’s just your 840i firing up its circuits. The light should turn off in a bit, but come see us if it doesn't.

Are BMW 840i engine noises bad?

Strange engine sounds can be a sign something’s off in your BMW 840i. Knocking or tapping could be a symptom of low oil. Whistling sounds could mean you have an intake leak or misaligned belt. Squealing may be caused by a loose fan belt, and grinding could be a sign that something is wrong with your brakes — not the engine.

What could damage a BMW engine? [ordered-list-1-item-3-1]Are you unknowingly damaging your BMW 840i engine?

Certain driving habits can hurt your engine. These habits include driving on an empty fuel tank, flooring the gas pedal while the car is in Park, or slamming the gas pedal while the engine is still cold. Help sustain your engine’s performance and efficiency by staying miles away from these bad driving practices.

Can I add water to my BMW 840i radiator?

While it’s not recommended, you can use water in your 840i radiator in emergencies. Normally, you should only use a 50/50 mix of coolant and water or a pre-mixed coolant. However, if you are completely out of coolant and must continue driving, it’s better to have water in your coolant reservoir than nothing.

What can cause the engine in my 840i to suddenly stop?

Reasons your 840i car engine may suddenly stop include engine overheating, electrical troubles, mechanical issues, ignition system problems, faulty sensors, and low fuel.

Who can repair my BMW 840i engine?

For BMW 840i engine repair, trust your local Firestone Complete Auto Care. You can make an appointment today at any of our thousands of locations across the U.S.

Engine Repairs for Your 2021 BMW 840i

Learn about

2021 BMW 840i Trim Options

Select your BMW 840i trim level to learn more about BMW-recommended engine repair. Even BMW 840i parts will get older and change.

L6/3.0L

Repairs for Your 2021 BMW 840i

Nothing lasts forever. Even your BMW 840i’s engine parts and components will change. When something breaks or fails, we’re ready to help. Select a repair or category to learn more about 2021 BMW 840i services.

We’re Trained to Care for BMW 840i Engines

The BMW 840i is respected for its reliability. You probably thought about that when you got it. However, even your trustworthy engine is subject to wear and tear. 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. Since 1926, we’ve taken care of 500 million+ cars, so you can rest assured knowing your BMW 840i engine will be in good hands. 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.

Illuminated Check Engine Light on 2021 BMW 840i

If your 840i check engine light is on, it’s time to get it looked at. A steady or flashing check engine light could signal a serious issue with your car’s ignition, Possible causes can include a failing oxygen sensor, worn spark plug, a clogged catalytic converter, or a leaking engine vacuum, but that's only a few of the possible causes. Bring your 840i to Firestone Complete Auto Care to get computerized diagnostics and we’ll figure out why that check engine light is giving you grief. rattling sounds, burning smells, or misfiring.

2021 840i Engine Services

If your 2021 BMW 840i needs engine repair, our technicians will provide you with a thorough explanation beforehand. We make recommendations, but you make the final decision. If a repair can wait, we'll let you know. If it's necessary for your safety, we'll make sure you understand that, too. We seek to give you all the info you need to make a smart decision about our services. Turn to Firestone Complete Auto Care for your 2021 840i engine repairs and you can feel good knowing that we only use BMW-compliant replacement parts such as the cambelt, engine oil seal, fuses, or another part.

Questions About 2021 BMW 840i Engines

Why does the check engine light in my 840i turn on when I start my car? Generally, your check engine light turning on upon ignition is not a bad thing. It’s just your 840i firing up its circuits. The light should turn off in a bit, but come see us if it doesn't.
Are BMW 840i engine noises bad? Strange engine sounds can be a sign something’s off in your BMW 840i. Knocking or tapping could be a symptom of low oil. Whistling sounds could mean you have an intake leak or misaligned belt. Squealing may be caused by a loose fan belt, and grinding could be a sign that something is wrong with your brakes — not the engine.
What could damage a BMW engine? [ordered-list-1-item-3-1]Are you unknowingly damaging your BMW 840i engine? Certain driving habits can hurt your engine. These habits include driving on an empty fuel tank, flooring the gas pedal while the car is in Park, or slamming the gas pedal while the engine is still cold. Help sustain your engine’s performance and efficiency by staying miles away from these bad driving practices.
Can I add water to my BMW 840i radiator? While it’s not recommended, you can use water in your 840i radiator in emergencies. Normally, you should only use a 50/50 mix of coolant and water or a pre-mixed coolant. However, if you are completely out of coolant and must continue driving, it’s better to have water in your coolant reservoir than nothing.
What can cause the engine in my 840i to suddenly stop? Reasons your 840i car engine may suddenly stop include engine overheating, electrical troubles, mechanical issues, ignition system problems, faulty sensors, and low fuel.
Who can repair my BMW 840i engine? For BMW 840i engine repair, trust your local Firestone Complete Auto Care. You can make an appointment today at any of our thousands of locations across the U.S.