Code P0171 help

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Dec 2, 2011 | 11:42 AM

Ben34

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Joined: Nov 2004

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Code P0171 help

Ok, I thought I had diagnosed this one myself but the dreaded "service engine soon" light came back on. a few weeks ago I got a code P0171 (system too lean bank 1) and did some research. I have a K&N filter and figured maybe it built up enough oil on the MAF sensor and caused the code. I cleaned the sensor and all looked good until this past weekend. It was a little warmer and I drove the truck for about 30 minutes on the highway (first trip other than in-town driving since I cleaned the MAF). When I restarted, the light came back on. I have not scanned it but I'm thinking it will probably be the same code. It seems to run just fine so no misfires or anything. Am I looking at O2 sensors next? Thanks in advance.

2000 V-6 5-speed, 120k miles

Dec 2, 2011 | 04:53 PM

phil6608

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From: Stanton DE

Find out what the code is first!
Before I wend spending money on new 02s, I would look for a vacuum leak.

Dec 2, 2011 | 07:20 PM

Bluegrass 7

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Joined: Sep 2006

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The 171 code is never due to a faulty OX sensor.
The sensors only detect the fault and reports it by code.
Ox sensors have their own codes for their faults.