There were no other fault codes related to these, only those three. But only a few days later back to crazy idle rpms. It was feeling like car had lost its mind and was not really following my gas pedal input at low rpms. This was happening not only during take off but also during low rpm driving, below 2K rpm. Then a few seconds later if I had managed to take off without stalling, suddenly the anemic condition of engine was going away and I would feel this as a sudden forward thrust as engine all of a sudden was back to full power. Certain times it was becoming difficult to take off without stalling the engine (I have manual transmission), because even I was depressing the gas pedal it was as if something was reducing gas pedal input. Car was usually feeling anemic at low rpms. But instead it was going down slow by slow and then up a bit and down a bit as if the engine was nervous and couldn't decide what to do. Normally it should have settled down to somewhere around 650 rpm after one or two seconds coming to full stop. Sometimes idle RPM wasn't settling at all after coming to a stop. On idle, engine RPM was intermittently dipping, to the point of almost engine shutting down, but was recovering immediately. At warm engine idle, RPM needle was usually very close to 500 rpm mark or on the 500 rpm mark On cold start up engine rpm was most often shooting up to between 2.5K and 3K rpm, then quickly going down. Of course the SES light was on because of above codes Fault Code thrown: 2D06 value HFM to high (OBD version: P1424 Mass or Volume Air Flow Too High) Fault Code thrown: 2A2F Mixture too rich (OBD version: P0175 System too rich bank 2 ) Fault Code thrown: 2A2E Mixture too rich (OBD version: P0172 System too rich bank 1 ) For instance 328 N52's are using different part number MAF even though the MAF from outside looks very much same physically and could be prone to same problem. Yours may be using different part number MAF. To start the long story, I have a first year (2006) US N52 (325XI) with a certain MAF sensor part number: 13627520519. Summary for TLDR people: MAF sensor connector was not making solid good connection due to too may connect disconnect cycles over 10 year service the life of the car and also due to what I believe too thin connector pins on the MAF sensor side for the connector pins used. I am only sharing my experience with no claim that what I describe here is safe or correct way of working on the car. If you decide to use what I describe here, use your own judgement, safety, consult BMW shop manuals or trained mechanics. What I am writing here is my own experience and I can't give any guarantees what I describe and explain is correct information or the right and safe way to work or do to a car. Some disclaimers: I am not a trained mechanic. After long trial and error and some testing and research I am confident I found the root cause and wanted to share since I saw other old posts with same problems with no conclusions to solutions from other people. This is a post of sharing my experience with a difficult to diagnose stubborn "system too rich" and occasional "Mass or Volume Air flow too high" codes being thrown with SES light and idle and some drivelability problems.
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