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

It’s usually normal for your check engine light to turn on upon ignition. It’s just your 840i xDrive firing up its circuits. The dash light shouldn't stay on. If it does, you might want to bring your vehicle in for service.

Why is my BMW 840i xDrive making engine noise?

Unusual noises can signal a problem with your BMW 840i xDrive engine. Tapping or knocking could mean you need an oil change. A high-pitched whistle could signal an intake leak or misaligned belt. Squealing can indicate a loose fan belt, and grinding could be a sign that something is wrong with your brakes — not the engine.

What could damage my BMW 840i xDrive engine?

Some driving habits are not so great for your engine. These include driving on a near-empty gas tank, revving the engine while still 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 add water to my BMW 840i xDrive 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 840i xDrive when you’re out of coolant, having water in the coolant reservoir is better than nothing.

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

There are different reasons your 840i xDrive vehicle engine could suddenly stop. You may be looking at a lack of fuel, faulty sensors, issues with the ignition system, engine overheating, electrical problems, or mechanical troubles.

Who fixes BMW 840i xDrive engines?

Your local Firestone Complete Auto Care has you covered with expert 840i xDrive engine repair. Schedule an appointment today and see us at one of our thousands of locations.

2025 BMW 840i xDrive Engine Repair

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2025 BMW 840i xDrive Trim Options

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

2025 BMW 840i xDrive Repair

Stuff wears out. Even your BMW 840i xDrive's many parts and pieces. When something breaks, we're ready. Click on a repair below to learn more about 2025 BMW 840i xDrive repairs.

We Care for BMW 840i xDrive Engines

The BMW 840i xDrive is respected for its reliability. You may have even been thinking about that when you bought it. However, even your trustworthy engine is subject to wear and tear. Sometimes plans go sideways. If the unexpected strikes, you may search the internet frantically for quick and affordable 2025 BMW 840i xDrive engine repairs. 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 840i xDrive 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.

Illuminated Check Engine Light on 2025 BMW 840i xDrive

An illuminated check engine light on your BMW 840i xDrive is one of the first signs it's time to 'brake' for engine service. A check engine light that’s flashing or steadily illuminated could point to problems with your or emission system that won't go away on its own. Possible causes can include a failing oxygen sensor, damaged spark plug, a clogged catalytic converter, or an engine vacuum leak, to name a few potential sources. Stop by your local Firestone Complete Auto Care to get your 840i xDrive issues diagnosed and we'll determine exactly why your check engine light is on. Other signs your BMW 840i xDrive engine needs some TLC are oil leaks, or misfiring.

2025 840i xDrive Engine Services

When your BMW 840i xDrive engine needs repairs, our technicians will make sure you understand what’s going on before they start working on your engine. We make recommendations, but you make the final decision. If a repair isn’t urgent right now, we’ll let you know. We'll also tell you if it's necessary for your safety. We want to give you all the details you need to make an informed decision about your engine repairs. By choosing Firestone Complete Auto Care for 840i xDrive engine repairs and you can feel confident knowing that we use BMW-approved parts and components like the timing chain or belt, valve guide seal, fuses, or other parts.

Questions About 2025 BMW 840i xDrive Engines

Why does the check engine light in my 840i xDrive turn on when I start my car? It’s usually normal for your check engine light to turn on upon ignition. It’s just your 840i xDrive firing up its circuits. The dash light shouldn't stay on. If it does, you might want to bring your vehicle in for service.
Why is my BMW 840i xDrive making engine noise? Unusual noises can signal a problem with your BMW 840i xDrive engine. Tapping or knocking could mean you need an oil change. A high-pitched whistle could signal an intake leak or misaligned belt. Squealing can indicate a loose fan belt, and grinding could be a sign that something is wrong with your brakes — not the engine.
What could damage my BMW 840i xDrive engine? Some driving habits are not so great for your engine. These include driving on a near-empty gas tank, revving the engine while still 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 add water to my BMW 840i xDrive 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 840i xDrive when you’re out of coolant, having water in the coolant reservoir is better than nothing.
What can cause the engine in my 840i xDrive to suddenly stop? There are different reasons your 840i xDrive vehicle engine could suddenly stop. You may be looking at a lack of fuel, faulty sensors, issues with the ignition system, engine overheating, electrical problems, or mechanical troubles.
Who fixes BMW 840i xDrive engines? Your local Firestone Complete Auto Care has you covered with expert 840i xDrive engine repair. Schedule an appointment today and see us at one of our thousands of locations.