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DIY: Crankshaft Position Sensor Replacement

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60K views 6 replies 5 participants last post by  335dtorque  
#1 · (Edited)
Here is how I replaced my Crankshaft Position Sensor. The hardest part of this procedure is diagnosing the problem. OK that's not really part of the procedure. The real hardest part is removing the cover under the car.

1) Jack the passenger side of the car up. Use a floor jack and a safety block under that part of the car where this is recommended. If you just toss it under there and jack, you can push stuff around that isn't meant to support the weight of the car.




2) Crawl under the vehicle on your back with your head under the engine. See Photos.


3) Remove the 10ish bolts that hold that part of the engine cover on. One is a philips-head screw. The other are simply bolts. I don't remember the size, but it's one of the ones we have in our toolkit next to the battery.


The New Part!


4) Use a allen wrench (hex key) to remove the single bolt that holds the sensor in place. See photos. You may alternatively remove the wiring harness first, but it doesn't really matter, as long as the car is off... (who would crawl under the car while it was on? Also this stuff is right next to the passenger side exhaust so...don't touch it if it is warm/hot, etc.)
 
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#2 ·
AND....


5) Swap out part and repeat steps in reverse order!


My old one had a bunch of metal shavings stuck magnetically to it. I believe this caused it to fail intermittently.
:thumbup:
 

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#5 ·
You get a check engine light when the CPS goes bad. The engine does not run extremely rough, it just seems to lose power at low rpm.

You are probably right, either a motor mount if the whole engine is shaking (open the hood to check) or if the engine is not shaking my guess would be something to do with active steering if you have it.
 
#6 ·
Here is how I replaced my Crankshaft Position Sensor. The hardest part of this procedure is diagnosing the problem. OK that's not really part of the procedure. The real hardest part is removing the cover under the car.

1) Jack the passenger side of the car up. Use a floor jack and a safety block under that part of the car where this is recommended. If you just toss it under there and jack, you can push stuff around that isn't meant to support the weight of the car.
View attachment 262433

View attachment 262434

2) Crawl under the vehicle on your back with your head under the engine. See Photos.
View attachment 262435

3) Remove the 10ish bolts that hold that part of the engine cover on. One is a philips-head screw. The other are simply bolts. I don't remember the size, but it's one of the ones we have in our toolkit next to the battery.
View attachment 262436

The New Part!
View attachment 262437

4) Use a allen wrench (hex key) to remove the single bolt that holds the sensor in place. See photos. You may alternatively remove the wiring harness first, but it doesn't really matter, as long as the car is off... (who would crawl under the car while it was on? Also this stuff is right next to the passenger side exhaust so...don't touch it if it is warm/hot, etc.)
View attachment 262438
Thanks for the DIY. I noticed the part I removed looked a lot different and was missing the gasket.
I have a 2004 BMW 645CI. Do you have the Spec for the bolt. What happens if it's over tighten?

Left is new from Indy shop, Right is old part.

 
#7 ·
Here is how I replaced my Crankshaft Position Sensor. The hardest part of this procedure is diagnosing the problem. OK that's not really part of the procedure. The real hardest part is removing the cover under the car.

1) Jack the passenger side of the car up. Use a floor jack and a safety block under that part of the car where this is recommended. If you just toss it under there and jack, you can push stuff around that isn't meant to support the weight of the car.
View attachment 262433

View attachment 262434

2) Crawl under the vehicle on your back with your head under the engine. See Photos.
View attachment 262435

3) Remove the 10ish bolts that hold that part of the engine cover on. One is a philips-head screw. The other are simply bolts. I don't remember the size, but it's one of the ones we have in our toolkit next to the battery.
View attachment 262436

The New Part!
View attachment 262437

4) Use a allen wrench (hex key) to remove the single bolt that holds the sensor in place. See photos. You may alternatively remove the wiring harness first, but it doesn't really matter, as long as the car is off... (who would crawl under the car while it was on? Also this stuff is right next to the passenger side exhaust so...don't touch it if it is warm/hot, etc.)
View attachment 262438
Actually a legend none of these YouTube videos help these pictures did thank you 🙏