Skip the auto shop - Our mechanics make house calls

Q: CEL bad bearings alternator

asked by on

My check engine light is on and a mechanic told me the bearings were bad in my alternator is causing the engine to run allot louder then it should. Do you know what the problem is? How can it be fixed?

Hi there. Thanks for writing in about your 2008 Mercedes Benz C350. If the alternator is failing and not supplying the right voltage to the system, then this can cause the Check Engine Light to come on. If the bearings are failing then the alternator will make a lot of noise. If this is the case, then the alternator needs to be replaced. If you want someone to give this a second look, consider YourMechanic, as a certified mechanic can come to your home or office to inspect the louder-than-normal noise and replace the alternator if needed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Clutch squeaking in first gear in 2004 Subaru WRX Wagon

You must be a very good driver, because it's a 12-year-old Subaru and those are fast, little cars. Normally, those clutches are going to wear out a long time before that. It could easily be a throw-out bearing. If...

Q: Can I reset the computer and if so how?

Hi. The radiator shouldn't make the Check Engine Light come on if it is bad. Your Check Engine Light is on because there is a sensor in your engine sending a bad message to the PCM. To solve this problem,...

Q: Engine shuts off while braking

Hello. If your vehicle has stalled, and will no longer turn over then it may possible that the alternator has failed. A faulty alternator will not be able to properly charge the battery. This will place a drain on the...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...