L36 + New Oxygen Sensor + Gutted Airbox/!MAFScreen = P0171 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-18-2007, 05:27 PM   #1
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Default L36 + New Oxygen Sensor + Gutted Airbox/!MAFScreen = P0171

Hey all,
By now I am sure the moderators are like, "Oh no, Not this guy again", but I have been having a problem with my car in terms of the fuel economy/air fuel ratio. I just replaced my front oxygen sensor with a new Denso unit, and I have seen an increase of fuel economy (my original goal). However, my SES light has been coming on and off in two day intervals since the new Oxygen sensor was installed, and gutting my airbox/descreening my MAF in a very careful manner. Code P0171 has been coming up on my SES light (thanks to Autozone). This is a lean condition in "bank 1". Can anybody tell me what I should do, I put everything in/gutted everything very carefully giving care to the sensing components of all the electronics involved. Thanks.
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Old 12-18-2007, 05:43 PM   #2
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Did you touch the MAF sensor at all? Try putting the screen back in. Also check your battery cable connections, clean the terminals of corrosion and reinstall them snugly.
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Old 12-18-2007, 06:43 PM   #3
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Agreed put your MAF screen back in, clear the code and see if it comes back. The screen is there to straighten out the airflow over the MAF so it can function properly.


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Old 12-18-2007, 07:21 PM   #4
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We have seen some that had issues with the Screen Removal... Even I went back tot he Screen and the Fueling was a bit jumpy.. Could never get it quite right till I reinstalled that screen..

The Scree keeps the air Laminar across the MAF, without the screen its hard to get a good true reading on the Mss of air flowing through the TB..

I'd also like to see what happens with the screen installed and if the code comes back again..

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Old 12-19-2007, 12:02 AM   #5
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I'd hate to say it, but the screen has gone to heaven. I don't know how you can put it in/get it out without breaking it (or spending a decent amount of time doing so). I did not touch the sensor at all, but i poked the screen with my finger, causing it to fracture. I just pulled it out from there. My LS1 Camaro has the !MAF Screen done to it, and theres no adverse effects there. I guess every setup is different.
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Old 12-19-2007, 12:28 AM   #6
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Post a topic in the wanted section and I bet someone can hook you up. Do you still have the ring that locks the screen to the TB?
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Old 12-19-2007, 09:13 AM   #7
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Yea, I just pulled the screen out. There wasn't a ring that came out with it. I am guessing that it just snaps on? Please advise.
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