New/old problem following replacement of post cat oxygen sensors

Mike6

Senior member
Apologies for posting again but after my trusted garage replaced both post cat oxygen sensors ( I was getting a code for heater element on bank 1) I have periodically been getting codes 2882 and 2883 DME mixture preparation for both banks. Garage have rechecked their work on replacing the sensors as the old ones had to be burnt out and have confirmed that even though the manifold threads had to be recut the sensors are tight and nor letting in air.
I have checked all intake pipework and routinely changed check valve pipe to servo but could not find any leaks or cracks. Every time the codes pop up I simply clear the errors and car seems to drive normally.
Yesterday however during a spirited drive, dashboard lit up and car juddered without any power. I pulled over and plugged in my creator 310 and sure enough it was showing codes 2882 and 2883 but also 28A2 DME air path monitoring. I cleared the codes and car drove home fine although I was less enthusiastic with the throttle.
Does this additional code put me in a different ball game. I have read of possible problems with the ECU but car has only just covered 60k miles and has been a bit of a garage queen so I hope not.
I have probably run out of possible avenues to explore and still think that codes 2882 and 2883 only came on after the oxygen sensors were replaced.
I am a bit nervous about the engine cutting out so will probably have to go back to the garage so would welcome any thoughts on what might be the next steps ie could air be getting in via the recut manifold and might this throw code 28A2
Thanks for any ideas.
 
No sorry, car been in hibernation over winter but will come out of garage next month and probably go straight into garage for a more in depth analysis. All very annoying as I hate to admit defeat.
Are you having similar problems.
 
Mike6, from your first post, your car has a 2.5L M54, similar to an E46 I once owned. Since you have an experienced shop whom you trust, have them look at the CCV (PCV) system. Your mileage is very low, but 23 years is plenty of time for plastic CCV hoses to get brittle and crack.

A bad CCV could produce your lean condition, though it should be detectable by a smoke test. Smoke tests can sometimes be tricky, particularly if you have the "cold climate" CCV with foam covering all the pieces. The shop should be able to decide whether it is or isn't your problem.

Here's a link to a thread that might apply : M54 lean codes, some fixed with new CCV.

Whether my comments help or not, I hope you get it fixed !
 
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