Quote:
Originally Posted by mendes9
196K, I'm in the same boat P1093 bank 2 ... I'm going to try a clear adaptions with ISTA. I did it with my autel but didn't work. Replace both O2 sensors on bank 2, but no reason to believe they are bad as they respond fine. Output voltage on downstream o2 is low at times, and bank 2 fuel trim is slightly high at 7 to 9% (again at times), both long term fuel trims are below 1%. 3 months until inspection expires.. the clock is ticking.
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Never read this thread before, so here's my 2 cents input.
I've never had a P1093, but initially, before I started doing MAF resets, I was having repeated problems with P0171 and P0174 (lean codes) going so far above normal range that the SES (CEL,MIL) would trip. This started just following inspection in late Oct '21. For the last four years I've been trying to find what's wrong, and though the fuel trims have sttled down a bit, I'm still looking.
Many smoke tests, fuel pressure tests, MAF sensor resets and/or replacements, DISA rebuild, ICV tests and cleaning, etc. (plus some experiments that could've fried my DME, but didn't) later, like mendes9, i'm going to do more testing, as is my habit, this time of year.
It's because I'm three months away from another yearly inspection/emissions check (fortunately, the final one required for my '01 X5, which will be 25 next year, not subject to testing), and I always fear that the SES light will appear while at the inspection station. I have been resetting the MAF, then completing the "drive cycle" and immediately driving to the station, for the last few years.
Maybe not so, this year.
X5chemist magnanimously sent me his used "Siemens/VDO" MAF sensor for me to use while testing
start with post#43 https://xoutpost.com/bmw-sav-forums/...ml#post1245039, and though I've not driven many miles since (probably under 300), and had to reset the DME twice during that time (Trifecta once, battery disconnect once), no more lean codes have appeared.
I tried using my original Siemens MAF until it went completely off the rails, and two other cheap $20 MAF's that would be good for awhile before I had to reset the MAF/fuel trims (I cleaned them and carry them in my trunk as spares, just in case), but it seems that my M54 really prefers a Siemens MAF. Your engine probably does too.
If
X5chemist wants/needs the MAF back, I'll probably try an alternative (German-made brand) from FCP Euro, ECS Tuning, or even Rock Auto, since my non-existent budget keep me from buying a genuine new Siemens or BMW-OEM MAF. The $20 cheao units from Amazon were useful, but not quite good enough for the tastes of my X5. I'm still hoping (but not expecting) to find the root cause of my elevated fuel trims...LongTerm from +3 to +8%, usually, lately, at any speed, with ShortTerm trims trying to balance those numbers. I'd like to see LTFT's stay around zero, like my '04 Chevy 2500HD 6.0L engine has, always.