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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 06-04-2011, 03:28 AM   #1 (permalink)
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replaced (and swapped) CPS - still code. what next?

Hello everyone.

Picked up a 1999 540i 6 speed a couple weeks ago. It promptly threw a code 71 (using a Peake II) "camshaft position sensor" cyl 1-4. This made sense as the car was running somewhat rough and is prone to stalling when coming to a stop. I purchased a new one, replaced, cleared the code and it returned within 5 minutes of running. From reading some posts afterwards it looks like I made a rookie mistake and bought one from BAVauto. I was actually ok with that as I was really hoping it was a simple sensor. but I went out there and decided to swap the functioning drivers side sensor with the faulty passenger side. I then cleared the codes and within 5 minutes it came back up 71. Bummer. So, presumably the sensor is most likely ok. So now I have a couple of questions:

1. If I assume the code is somehow correct how do I troubleshoot further? I have already cleaned the CPS connector at the top of the engine without results.

2. Could something else trigger the CPS fault? your best guess.

Thanks for your help.
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Old 06-04-2011, 07:49 AM   #2 (permalink)
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My best guess? ICV, Idle control valve !!
By "trying" to stall, the engine will try to recover without success, hence micky-mouse codes... Just another thought mate !!!
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