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  #21  
Old 05-07-2019, 12:23 PM
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Can someone please explain the fact that, if we reset the fuel adaptation, P1092 went away for a long-long time (> 2.5K + miles in my case) before it came back?
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  #22  
Old 05-07-2019, 02:39 PM
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I'm having very similar situation with car running too lean.

My theory is that some component is feeding a slightly incorrect number into the computer. It's subtle enough the computer gives the misbalance "pass" waiting for the bad tank of fuel etc. to work itself out.

I suspect the MAF or pre cat O2 in my case but it can be a worn out capacitor in the ECM.

When I look at my fuel trims they are constantly high but not crazy high say 7% but always. Never 2% never negative. The computer probably takes an integral of the fuel trim and if always positive like my case it will only get bigger. It simply has to have some threshold that trips it.

Now for me here's a twist: I didn't have my scan tool with the last time my SES came on and after two days it did the unimaginable thing of clearing itself. I'm very curious to see if my trims worked themselves out. The computer should know over time to make a long term fuel trim to get short term to be close to zero so maybe mine finally worked out the kinks.
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  #23  
Old 09-11-2019, 03:17 AM
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I replaced the MAF; still having the P1093 code; next replacements will be downstream o2 sensors
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  #24  
Old 09-11-2019, 11:05 AM
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Replacing the downstream O2 will likely fix the problems with p1092 AND p1093. I am having this problem (P1092) for about two + years without any good resolution - until the last two months/2,000+miles. Thought that I already replaced all 4 O2 last year (read my story), P1092 never actually went away for long... My independent mechanic told me to replace the downstream O2 AGAIN BUT USE ONLY DENSO brand (I was using BOSCH). He said that he no longer trust BOSCH' O2s. After replacing and fixing all items mentioned and suggested in this thread, i was pretty much hit a wall. One day, I was looking on Amazon for something else but saw a downstream DENSO O2 for our car at an unbelievable low price so I said to myself, what the heck, why don't I just try DENSO...
It's been going good with me, I am still watching and monitoring but this is the longest time for me to stay clear of this painful SES light.
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  #25  
Old 09-11-2019, 11:06 AM
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You definitely need to reset adaptions.

My downstream sensors both under 15,000 miles old died and gave me one drive error. When I replaced and cleared the codes I drove about 100-200 miles and I got another O2 based code. Reset adaptations and no code for a while.

I think I might have a minor exhaust leak maybe at the SAP valve I really hope not at the manifold that's not a fun job. That could through off the math just like unmetered intake air. Unmetered exhaust may be causing some of our weird O2 sensor readings.

I replaced my post cat sensors with Bosch and saw an immediate difference in how they performed. I need to do the same with the pre cat sensors. I would not use non OEM again. I bought a set maybe as a social experiment that were German made knock offs. $44 for a PAIR. They seem to work but one outright failed after half a year or so (they replaced no questions asked under warranty). That said I still seem to get these random odd lean errors after a few months and very likely from the non OEM pre cat O2.
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  #26  
Old 09-13-2019, 01:34 AM
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so andrew, do you still have the p1093 code? i see that you are also battling this some time. it is almost making me lose hope for this car
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