replaced (and swapped) CPS - still code. what next?

[huyatgr]

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.

[Jack Dabsy]

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 !!!