Why does my 525i’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 525i firing up its circuits. The light should go off shortly. Bring your vehicle in if it doesn't.

Why is my BMW 525i making engine noise?

Unusual noises can signal a problem with your BMW 525i engine. Knocking or tapping could be a symptom of low oil. Whistling could mean a belt is misaligned or there's an intake leak. Squealing can be traced back to a loose fan belt, and grinding might be a sign of brake problems rather than engine issues.

What could damage a BMW engine? [ordered-list-1-item-3-1]Are you unknowingly damaging your BMW 525i engine?

Some driving habits are not so great for your engine. These include driving on a near-empty gas tank, revving your engine while the vehicle is in Park, or accelerating too quickly, too soon. Protect your engine’s performance and efficiency by distancing yourself from these habits.

Can I use water in my BMW 525i radiator?

It’s not recommended you put water in your 525i radiator unless it’s an emergency. Under normal circumstances, use a 50/50 mix of water and coolant or a pre-mixed coolant. But, if you need to keep driving while out of coolant, using water is better than driving with an empty coolant reservoir.

Why did my 525i engine suddenly stop?

Your 525i 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 525i engine?

Your local Firestone Complete Auto Care has you covered with expert 525i engine repair. Schedule an appointment today and see us at one of our thousands of locations.

Engine Repairs for Your 1991 BMW 525i

Learn about

1991 BMW 525i Trim Options

Select your BMW 525i trim level to learn more about BMW-recommended engine repair. Even BMW 525i parts will get older and change.

L6/2.5L

1991 BMW 525i Repair

Stuff wears out. Even your BMW 525i's many parts and pieces. When something breaks or fails, we’re ready to help. Select a repair or category to learn more about 1991 BMW 525i services.

We’re Trained to Care for BMW 525i Engines

BMW 525i drivers trust that their 525i will take them near and far. That might be why you bought it in the first place. However, even your trustworthy engine is subject to wear and tear. Things can go wrong on the road. If they do, you’ll have to find a dependable 1991 BMW service center — quick! Luckily, you won’t have to look far, since Firestone Complete Auto Care has 1,700+ locations across the country. We've serviced more than 500 million vehicles since 1926, and our technicians know BMW 525i engines. Schedule a courtesy inspection at the first sign of engine trouble. After all, Firestone Complete Auto Care is one of the most popular picks for professional engine repairs thanks to its service and affordability.

My 1991 BMW 525i Check Engine Light Is On

If your 525i 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 or emission system, and it won’t go away by ignoring it. Causes may include a faulty oxygen sensor, bad spark plug, a problem with your catalytic converter, or an engine vacuum leak, to name a few potential sources. Bring your 525i in for an on-board diagnostic check and we’ll figure out why that check engine light is giving you grief. Other signs your BMW 525i engine needs some TLC are essential fluid leaks, or engine misfiring.

Engine Repairs for Your 1991 525i

When your BMW 525i engine needs repairs, our technicians will provide you with a thorough explanation beforehand. We don't start working until we have your approval. If a service can wait, we’ll make sure 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 525i engine repairs and you can feel confident knowing that we use BMW-approved parts and components like the cambelt, engine oil seal, sensors, or a different component.

1991 BMW 525i Engine Q&A

Why does my 525i’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 525i firing up its circuits. The light should go off shortly. Bring your vehicle in if it doesn't.
Why is my BMW 525i making engine noise? Unusual noises can signal a problem with your BMW 525i engine. Knocking or tapping could be a symptom of low oil. Whistling could mean a belt is misaligned or there's an intake leak. Squealing can be traced back to a loose fan belt, and grinding might be a sign of brake problems rather than engine issues.
What could damage a BMW engine? [ordered-list-1-item-3-1]Are you unknowingly damaging your BMW 525i engine? Some driving habits are not so great for your engine. These include driving on a near-empty gas tank, revving your engine while the vehicle is in Park, or accelerating too quickly, too soon. Protect your engine’s performance and efficiency by distancing yourself from these habits.
Can I use water in my BMW 525i radiator? It’s not recommended you put water in your 525i radiator unless it’s an emergency. Under normal circumstances, use a 50/50 mix of water and coolant or a pre-mixed coolant. But, if you need to keep driving while out of coolant, using water is better than driving with an empty coolant reservoir.
Why did my 525i engine suddenly stop? Your 525i 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 525i engine? Your local Firestone Complete Auto Care has you covered with expert 525i engine repair. Schedule an appointment today and see us at one of our thousands of locations.