Need help with codes, CEL

[nick3753]

2012 with 160k miles and starting to show her age.

I've been getting an intermittent Increased Emissions CEL that past few months. Light will go out and may not come back for a month or two, but the following codes continue to populate (via Carly):

2772 -O2 sensor pre cat bank 2

27AA -DME: Charge plausibility, diagnostic hot -bank 1

27AB -DME Charge plausibility, diagnostic hot -bank 2

Back In June I did have 2771 (O2 pre cat bank 1) pop up as well with the same codes as above, but it has not since then.

The only symptom is a slightly rough idle at times (rpms stay steady). The other morning with a cold start I did have some RPM fluctuations as I drove off in cooler temps and over the years this hasn't been that uncommon in colder weather. Normally I wait for the cold start cycle to complete but was in a rush.

Plugs, Fuel tank breather valve (2nd time), thermostat and sensor replaced back in late May or early June.

I'm going to guess bank 2 pre cat sensor, but in my search for the same codes came across the low pressure fuel sensor as a possible cause when getting both 2772 and 2771 codes.

Any help or guidance is much appreciated.
Thanks
-Nick

[tmafuru]

You clearly can't bear the cost of a BMW . At the point when you can manage the cost of a low mileage BMW in no less than five years of age, you are "in the game". Up to that point, purchase a sensible Honda, Toyota, or, ideally Mazda. Any other way it will end up being a cash pit. Seriously, as a long term BMW purchaser, this is sound exhortation.







192.168.100.1 192.168.1.1

[amrazM]

you should've replaced all 4 o2 sensors together, they were available on rock auto with the bosch part number.