Skip the auto shop - Our mechanics make house calls

Q: Fixed crank shaft position sensor and engine light still on 2001 BMW 325i

asked by on

Okay so My car had been stalling to start and the check engine line came on, so natrually I took it to my dad's mechanic. He then put the scanner in my car and said it was the crank shaft position sensor, so I bought it and he had installed it and that day the light had gone away, but thecar was still having trouble starting so he assumed it was the spark plugs that needed changing, so the next day i went to buy the spark plugs and the light came on again and i called him and he said hed take a look at it when he changed the spark plugs, so when he came, he changed the spark plugs and put the scanner in again and it said that the crank shaft position sensor was acting up again, so my question is What could be wrong with my car that it's not accepting this new crank shaft? because he reccomends getting the crank shaft straight from the bmw dealer instead of another brand but I don't want to keep paying for a new crankshaft and paying the labor fees if the car will keep acting up

My car has 149000 miles.
My car has an automatic transmission.

Hi there - there are a couple of possibilities. First off, the new crankshaft position sensor (CPS) could be faulty - not all replacement parts are reliable. Second - there could be a problem with the wiring for the CPS circuit. Some engines use both crankshaft and camshaft position sensors to apply more accurate spark timing for the engine. The loss of either signal sometimes triggers a misleading code. SInce your engine is still hard to start, and the Check Engine is still illuminated, I would recommend an engine inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

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!
  • Home
  • Questions
  • Fixed crank shaft position sensor and engine light still on 2001 BMW 325i

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: Get transmission fixed or scrap car?

Hey there. You may find replacing the transmission to be your best option. If everything else has been checked and is good, then it would be fine to go ahead with replacing or rebuilding the transmission. Make sure to get...

Q: check engine light on 2002 325i bmw

Hi there: Anytime an error is detected it stores a trouble code in the ECU which illuminates the check engine light on your BMW. In order to determine what's causing issues, or causing the check engine light to illuminate, you'll...

Q: Engine shakes and plug wires when checked with timing light look something like Morse code

Hi there. I would still be suspicious of the coil packs. If you have access to an oscilloscope, I would look for pulses off the crankshaft and camshaft sensors. If sensor pulses are even, change the coil packs. If the...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.