FIXED!!! Did a bunch of repairs and now CEL, DME errors P0021 and P0024 and misfires
 

So I did a bunch of work (to fix oil leaks and coolant pipe leak on my X5 4.4 N62) and after buttoning it all back together car idles very rough, bucks and CEL flashes or stays on. If I turn off and restart the engine then it idles fine as if nothing's amiss. The cycle restarts after car stays off for just a little while. Other than these issues the car now drives amazing and no more oil leaks and coolant leaks. Here're the errors I'm getting from INPA and GTI (note that they're all pointing to driver side of engine):

- 2A84: CDKENWS2: intake/inlet vanos 2: Limit stop adaptations out of valid range
- P0021 A camshaft position- timing over-advanced or system performance (bank2)
Possible causes (as shown in GTI):
o Vanos intake solenoid valve defective or soiled
o intake camshaft defective (vanos adjustment unit)
- 2A89: CDKAMWS2: outlet/exhaust vanos 2: camshaft adjustment has not reached retard/late position
- P0024 "B" camshaft -timing over-advanced or system performance (bank2)

And here are the repairs I did which fixed the oil leaks and coolant leak I had originally:D. Car did not have the above mentioned current issues before these repairs:
1) Replaced valve cover gasket and spark plug domes driver side only
2) Replaced upper timing cover gasket (heavy oil leak) and valvetronic motor gasket driver and passenger side
3) Replaced passenger and driver side vanos seals
4) Replaced coolant pipe with collapsible pipe:D. The coolant pipe seal had completely deteriorated causing major coolant leak from weep hole near the water pump.
5) Replaced water pump
6) Replaced intake manifold and valley pan gasket
7) Replaced crankcase ventilation pipes
8) Replaced Pressure Regulating Valve (passenger and driver side) - driver side had a crack
9) Replaced vacuum pump seals (heavy oil leak).
10) Replaced oil pressure sensor
11) Replaced coolant temp sensor
12) Replaced throttle housing gasket
13) Replaced eccentric shaft sensor (broke it during VC removal):banghead:.
14) Cleaned MAF with CRC MAF cleaner spray
15) Replaced O rings in the fuel injectors (was totally unnecessary as they were all good at current mileage 111K miles).:swear:
16) Replaced coolant reservoir (leaking at the seams).

All parts used were OEM BMW (except the coolant pipe). The error codes keep coming back after cleanup. As an attempt to fix the issues I'm having now, I also replaced one driver side camshaft position sensor and cleaned driver side vanos solenoids (with intake cleaner spray) and changed engine oil all to no avail. I've checked all connections. Now I'm stuck. I have a feeling the solution may be very simple- may be a difficult to find vacuum leak I created inadvertently during the repairs? Any ideas?

Thanks for any pointers.

Indy (Zahntech Auto) cracked the issue- the CPS sensors were swapped!!! On the 2005 X5 N62 the sensors are different on the driver sidehttp://www.xoutpost.com/images/smilies/dunno.gif The 2 camshaft position sensors, one for the exhaust camshaft (three pole connector, 12 14 7 518 628) and one for the intake camshaft (three pole pigtail lead cable, 12 14 7 539 172). Took them just an hour to figure out my mistake. http://www.xoutpost.com/images/smilies/thumbup.gif I had carefully labeled all the connections during removal and not sure how I messed up during assembly....may be orientation of the label. Although I took many pictures next time I'll make sure to take pictures of just everything and not rely only on labeling.


Car runs strong, idles great and initial fixes I had done are all good. Now I think I'll reward myself with a Dynavin N6 upgrade:D

13) Replaced eccentric shaft sensor (broke it during VC removal)

Replace with an OEM BMW part or something cheap from eBay, Amazon sellers?

Yes, all the parts used were OEM BMW (except collapsible coolant pipe of course) and bought from my local BMW dealer (I get parts at online prices. It's good to create a good business relationship with them for parts easy and quick availability at online/wholesale prices).

I've just come across a thread with an N62 engine that had similar symptoms and exact DME codes as mine after almost similar repairs. But the OP didn't come back to confirm conclusively that the issues were indeed fixed but mentions CPS in bank2 were replaced and car idled fine :damn:. I changed one CPS (part #12147518628) and still waiting for the dealer to receive the other one (part 12147539172). Crossing my fingers this will resolve the issue.:dunno:
http://www.xoutpost.com/bmw-sav-foru...-required.html

Changed the other CPS (part 12147539172), redid servomotor relearn using GTI service function and still no improvement. I'm now stuck not knowing what to do. I've rechecked all connections and everything looks good. My suspicion is that I may have somehow interfered with eccentric crankshaft mechanism when I broke and replaced the eccentric shaft sensor during VCG removal. May be I didn't put back the sensor properly. I'm basing this also from GTI diagnostic report. Looks like I just have to again remove the valve cover driver side.

Regarding the possible cause of these issues as listed by GTI, what does "Incorrect position of sensor wheel" refer to? Is this the wheel on the eccentric shaft #3? http://bmwfans.info/parts-catalog/E5...haft_actuator/

When 12v is supplied to the vanos solenoid, what is supposed to happen? Tried that and it just clicks. I read somewhere the inner cylinder should stick out? Anyone know?

:thumbup:Looks like I have found the solution to this issue and just can't wait to go home and try it out, which is "Activate the Ram backup on DME" via GTI!!!!!!!!!!!!!
http://www.bimmerforums.com/forum/showthread.php?1826040-Timing-VANOS-1-tooth-offset-to-crankshaft/page3

let us know, this sounds interesting. Did you by any chance touch the vanos, timing chain tensioner or sensor wheel? possibly causing the timing to jump?

I have been PM'ing X5only back and forth sharing ideas as I am having similar issues after doing nearly the exact same repairs (minus the valley pan gasket and coolant pipe). I am going to try and "Activate the Ram backup on DME" right now using PASoft. If anyone knows how to do that, please chime in.

X5only - Thanks again for sharing what you have been finding. I tried to send you a PM response, but your message box was full. I'll be checkin for updates.... Fingers are crossed for us both!

Aargghh, another huddle to jump-:yikes: according to this link (post #10 Coding a 2006 750Li with Progman - Bimmerfest - BMW Forums), the clear DME RAM in v57 DIS/GT1 is located within the oil disturbed test plan...
Functions->Service functions->Maintenance->CBS reset->CBS functionality, engine oil, disturbed.

The problem is that my DIS does not have the "Maintenance" option in Service Functions:( I have DIS v44 and v57. Looked everywhere for it and can't find it. Damn!

http://www.bimmerfest.com/forums/att...1&d=1382497658