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2000 Tacoma TRD
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239 Posts
Discussion Starter #1
So the infamous P0171 code has come back. I have cleaned the MAF sensor, cleaned the throttle body, replaced the PCV valve, replaced the fuel filter... and none of those have helped. I suppose my last resort is the O2 sensor?
 

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09' Tacoma TRD Offroad DC
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8 Posts
i beleve that P0171 code is Catalyst system efficency below threshold. Meaning your emissions is below standard. If you have already cleaned the MAF sensor and replaced all those other parts mentioned, your cat is at fault and replacement would be the only fix. I had this problem with my 99 2.7L tacoma. i did all the things you did, and still getting p0171 after 2-3 miles. replaced the cat and code never came back.
then about a month later my truck was bought back because of Frame Peferations! what a waste of a grand!!
 

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Registered
2000 Tacoma TRD
Joined
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239 Posts
Discussion Starter #3
i beleve that P0171 code is Catalyst system efficency below threshold. Meaning your emissions is below standard. If you have already cleaned the MAF sensor and replaced all those other parts mentioned, your cat is at fault and replacement would be the only fix. I had this problem with my 99 2.7L tacoma. i did all the things you did, and still getting p0171 after 2-3 miles. replaced the cat and code never came back.
then about a month later my truck was bought back because of Frame Peferations! what a waste of a grand!!
P0171 is System too lean, bank 1. P0420 is Catalyst system efficiency below threshold.
 
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