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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 05-31-2012, 10:36 AM
PServe PServe is offline
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Crankshaft position sensor

Hi,

I wondering if anyone came across this. I have an 01 325ci with 268,000 miles on it. The car had a camshaft sensor code. I had the exhaust cam sensor replaced but the code persisted. I than had the intake cam sensor replaced. After replacing the intake cam sensor the computer threw a crankshaft sensor code. I've since had the crankshaft sensor replaced 2 times but the code won't go away. Also, after replacing the intake cam sensor the car will not kick over right away when starting it.

Any ideas??
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  #2  
Old 05-31-2012, 10:50 AM
tchavera tchavera is offline
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I'm not sure but maybe the timing is off?

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  #3  
Old 05-31-2012, 11:11 AM
KenG KenG is offline
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What is the exact code?

I know it's a dumb question but was the sensor replaced with an oem one?
Knock off brands tend to be faulty
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  #4  
Old 05-31-2012, 12:04 PM
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KenG is correct....using anything other than a factory BMW-issue CPS is a waste of time and money....most of the aftermarket junk is faulty or craps out in short order.

Also, if you`ve never replaced your VANOS seals, *that* could be causing the problem. The bad seals allow the cams to go to full advance prematurely, giving a false CPS code.
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Old 05-31-2012, 12:04 PM
PServe PServe is offline
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The sensors are from carquest do don't think it's oem. I was also told could be worn timing chain. Could a worn timing chain cause the crank sensor code? I'll get a oem sensor in and see if that fixes it. Thanks
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Old 05-31-2012, 12:52 PM
cvx5832 cvx5832 is offline
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Quote:
Originally Posted by PServe View Post
The sensors are from carquest do don't think it's oem. I was also told could be worn timing chain. Could a worn timing chain cause the crank sensor code? I'll get a oem sensor in and see if that fixes it. Thanks
I'd start with the OE sensor. Timing chains aren't a common fault item on the M54 even with that many miles.
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Old 05-31-2012, 01:00 PM
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Quote:
Originally Posted by PServe View Post
I was also told could be worn timing chain. Could a worn timing chain cause the crank sensor code?
I would bet LARGE sums of money against this diagnosis....
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Old 05-31-2012, 04:01 PM
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Scott ZHP Scott ZHP is online now
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Febi is the OEM for the sensors, BTW.

They actually have the BMW part number on them, but come in a Febi box.
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  #9  
Old 05-31-2012, 04:17 PM
PServe PServe is offline
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Thanks everyone for the responses. The timing chain diagnosis threw me a bit. I mad an appointment with a highly recommended bmw mechanic by me for Wednesday. I'll post what he finds.

Thanks again for the advice!!
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Old 05-31-2012, 05:57 PM
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Quote:
Originally Posted by PServe View Post
Thanks everyone for the responses. The timing chain diagnosis threw me a bit. I mad an appointment with a highly recommended bmw mechanic by me for Wednesday. I'll post what he finds.

Thanks again for the advice!!
The timing chain is likely fine. I like Bob's VANOS diagnosis and the guys saying you need OEM sensors.
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  #11  
Old 05-31-2012, 10:09 PM
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Camshaft not the crankshaft right?
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  #12  
Old 05-31-2012, 10:20 PM
PServe PServe is offline
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Crankshaft. I had the intake cam sensor error first. As soon as the intake cam sensor was replaced the service engine light came up with the crank sensor. I've put 2 non oem crank sensors in but still having the issue and SES light will not get rid of the crank sensor code.
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Old 05-31-2012, 10:26 PM
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Yours is double vanos? Search, maybe crank error is symptom of vanos problem? Heard exhaust side effects engine more when bad.
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  #14  
Old 05-31-2012, 10:28 PM
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Quote:
Originally Posted by PServe View Post
Crankshaft. I had the intake cam sensor error first. As soon as the intake cam sensor was replaced the service engine light came up with the crank sensor. I've put 2 non oem crank sensors in but still having the issue and SES light will not get rid of the crank sensor code.
Stored codes cannot always be relied on as being 100% accurate, sometimes they just point you in the general direction, then you have to use your "BMW Sixth Sense" to nail down the actual root cause of the problem (re-read Post #4 in this thread).

Also, after replacing sensors, it normally takes several cycles of driving 15 or more miles before the system will clear the old stored codes.
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  #15  
Old 05-31-2012, 10:38 PM
PServe PServe is offline
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I've been driving the car for 2-3 weeks with this problem and over a week since the crank sensor was replaced for the 2nd time and the code won't clear. The car having trouble turning over when starting has been going on for 2-3 weeks also, since the crank sensor code came up. I saw post # 4 and I never changed the vanos so it could definitely be that.

Thanks

I'll keep you posted after I bring it in.
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  #16  
Old 05-22-2013, 10:44 AM
SDpnoy SDpnoy is offline
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So what was the cause?
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