50i N63 CEL code 0029E1

[carbonM]

The CEL came on for 2011 50i. I found the code 0029E1 - Mixture Control 2. My car has been running fine though with no noticeable issues. I cleared the code to see if it comes back which it did within driving 5 miles. So I knew something was going on.

I did a smoke test and found the upper PCV lines on both sides were cracked. Replaced those, cleared the code. But it came back within 5-10 miles of driving.

I used ISTA to test the o2 sensors and I got a "check was aborted due to implausible lambda values" Does that mean one or more o2 sensors are bad? I thought about swapping the o2 sensors to see if the code moves to the bank. But wanted to get some feedback on other ways to test before dropping the money on new o2 sensors.

Any other suggestions on troubleshooting would be appreciated!

[carbonM]

Figured out that the root cause was a dirty MAF sensor. Cleaned it and the code was cleared. I figured this out by swapping MAF sensors between intakes and the code moved from 0029E1 to 0029E0.

[525DA_touring]

Was it dificult to Change the maf Sensor ?