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Eric, Automotive Repair Shop Manager
Category: Car
Satisfied Customers: 29734
Experience:  Automotive Repair Shop Manager, Technician/JA Mentor
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What are some signs that your crank sensor is going?

Resolved Question:

What are some signs that your crank sensor is going?
Submitted: 7 years ago.
Category: Car
Expert:  Eric replied 7 years ago.



The two most common signs of a failing crank position sensor are (A)the engine intermittently dying while driving, accompanied with immediate restart, (B) no start condition with engine

Customer: replied 7 years ago.
Hmm, car hasn't done that. Driving a little jerky the past week or so though.
Expert:  Eric replied 7 years ago.



It has done one of the symptoms - no start condition. You said 3 times last week the engine would turn over but not start -thats a no start condition.


While sometimes it will set a fault code and turn the check engine light on, it doesnt do it all the time.


One of the difficulties in accurately diagnosing it is that if it is intermittent failure, then it will only test bad when the vehicle is not cranking, or engine cuts out while driving. Any other time, it will test good.


Other possibilites of intermittent no start conditions are : fualty fuel pump, secondary ignition problem- both of which will also only test bad when acting up

Customer: replied 7 years ago.
The mechanic can't get it in until next week. Do you think it will be okay to drive until Tuesday or so? Not driving any long distances, but still need the car for work!
Expert:  Eric replied 7 years ago.



It should be, but you need to be aware that being an intermittent problem, you could encounter a no-start condition between now and when your mechanic can see it.

Customer: replied 7 years ago.
I guess I'm just concerned that it will no start permanently between now and then.
Expert:  Eric replied 7 years ago.



There is a slight possbility of the crank sensor failing completely before next week. There is no way to forecast how much longer it will last. I have seen people drive with an intermittent crank sensor failure for a year or more, and I have seen some fail within a month of first showing signs of failing...



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