Z3 vanos code dilemma

[erichlbonny]

2000 Z3 2.3, M52TU vin- LG02738
I had a "check engine" light (Peake tool code-"VANOS, exhaust mechanically stuck") and took it to a garage in Finksburg, Md. I picked it up, after a VANOS actuator replacement ($3K), and had the identical engine code within a few miles. The garage then indicated, after their initial attempt, that it now needed a new timing chain and sprockets for an additional $4K. I didn't trust their judgement and brought the car home.
The same code has come up sporadically over time, with resets, and now about every 20 miles. It has never changed through the RMW vanos actuator replacement. Any thoughts on actual engine problems related to this code?

 

[erichlbonny]

Well, this dilemma was fixed by going to Danny at Benchmark Motors in Columbia. His expertise and knowledge of the vehicle was extensive. For a mire $150, they did several tests and reset the ECM for trouble free running now. Performance has definitely improved and there are no further codes! I added in some additional smoothness with a replacement of the primary timing chain tensioner with a hydraulic one. Not sure where RMW in Finksburg was going with the timing chain replacement..

 

[John in VA]

Great to see you trusted your instincts & sought a second opinion. You can buy lots of parts with the $$ saved!

 

[xtryfun]

Well, this dilemma was fixed by going to Danny at Benchmark Motors in Columbia. His expertise and knowledge of the vehicle was extensive. For a mire $150, they did several tests and reset the ECM for trouble free running now. Performance has definitely improved and there are no further codes! I added in some additional smoothness with a replacement of the primary timing chain tensioner with a hydraulic one. Not sure where RMW in Finksburg was going with the timing chain replacement..

Wow, that sounds super frustrating — I’ve had a friend with an early Z3 hit the same VANOS issues, and sometimes it’s not the actuator at all. A lot of times it can be timing-related, but it’s worth double-checking the solenoids, wiring, and oil flow first before jumping to a full timing chain replacement. Getting a second opinion from a BMW specialist who actually inspects the VANOS system is usually the safest move.
On a lighter note, while you’re working on the car and dealing with the engine stuff, I also like keeping a small xtryfun touch up paint kit handy — it’s great for fixing little chips or scratches that happen while wrenching around.