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  #11  
Old 04-24-2019, 08:04 PM
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Sorry my bad, yes I meant MAF. In addition, I missed stating a few other repairs:
dd) replaced fuel filter - not resolved
ddd) added 2 rear O2 foulers (sp?) - not resolved. Since they didn’t do anything, I took them off.
dddd) replaced again 2 new front O2, instead of Bosch, I used Denso. Short lived, the light went off for 1K+ miles then went back on and off
So yes, at this point , I haven’t touch or check these items: fuel pressure, fuel pump, fuel injectors, and the cats. I read from a couple places stating that checking the fuel pressure on our car (3.0 M54) , for some reasons, is not as simple as just attaching a gauge to to a valve in the fuel line? Could someone please tell me the correct procedure?
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  #12  
Old 04-24-2019, 09:10 PM
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Code 235 / P1092

Fuel pressure at the rail under the engine cover. It's a valve just like car tire. There are adapters to use with fuel pressure gauge. I use a cheap tire pressure gauge with a dial. I did once with a digital gauge but some seal inside apparently disolved so it died later.

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Old 04-25-2019, 02:26 PM
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After replacing your O2 sensors did you recalibrate your DME and reset your adaptations? I had replaced my sensors and after a little while I started getting a CEL light whcih would come back when reset. I recalibrated and cleared adaptations. Light went away and has been gone since.
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Old 04-25-2019, 07:50 PM
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Hmm, recalibrate DME? the mechanic who reset my fuel adaptation told me that he also “cleared” a few others codes... sorry, can’t remember what DME stands for? Does the DME calibration a different thing and required a different/specific processes?
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Old 04-25-2019, 07:52 PM
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Code 235 / P1092

FPR and fuel filter one in the same. (Well technically they are different but on e53 they are in the same assembly).

@tn52: are you running rich or lean? My car has been running lean for a while. I get a good long reprieve if I reset adaptations but the fuel trims are showing a story as well as the post cat O2 sensors. I'm getting too much air or too little fuel.

Low fuel pressure or vacuum leak or bad MAF are the main reasons, clogged injectors or crappy quality O2 sensors next on the list.

I'm going to do an explosive vapor intake test (where you pump propane or starting fluid etc. near intake parts and watch the real time fuel trims. Get a rich spike you found the vacuum leak)
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  #16  
Old 04-25-2019, 08:34 PM
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Quote:
Originally Posted by Tn52 View Post
Hmm, recalibrate DME? the mechanic who reset my fuel adaptation told me that he also “cleared” a few others codes... sorry, can’t remember what DME stands for? Does the DME calibration a different thing and required a different/specific processes?
I think it's also called the ECM, the engine control module. Recalibration is a different process than "clearing codes". Clearing adaptations is also a different function.
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Old 04-25-2019, 09:22 PM
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Code 235 / P1092

DME and ECM are the same.

DME digital motor electronics
ECU engine control unit
ECM engine control module
PCM powetrain control module

All mean the same thing.


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  #18  
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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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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  #20  
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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