02 sensor or something else?
Thread Starter
10th Gear
Joined: Feb 2024
Posts: 10
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From: Ca
02 sensor or something else?
Hey everyone, I'm attempting to fix a fuel trim issue that might be related to the 02 sensors.
on the way home from a family members the codes p0171, and p0174 popped up.
I ignored and got home, tightened the gas cap and cleared the codes.
The engine filter was disgusting so that got changed and the MAF sensor i cleaned.
Also the absolute throttle position was at 16, is that high?
The code came back, so I plugged in the scanner and watched the live data.
It didn't throw a code but twice while rpms were up
the o2 sensors voltage went to 0.
at the same time the MAF sensor reading went high.
I'm trying to diagnose this at home with my limited knowledge and stubbornness.
Could anyone provide me some insight?
Thank you.
on the way home from a family members the codes p0171, and p0174 popped up.
I ignored and got home, tightened the gas cap and cleared the codes.
The engine filter was disgusting so that got changed and the MAF sensor i cleaned.
Also the absolute throttle position was at 16, is that high?
The code came back, so I plugged in the scanner and watched the live data.
It didn't throw a code but twice while rpms were up
the o2 sensors voltage went to 0.
at the same time the MAF sensor reading went high.
I'm trying to diagnose this at home with my limited knowledge and stubbornness.
Could anyone provide me some insight?
Thank you.
Last edited by Craycrayfish; Sep 10, 2025 at 07:22 PM.
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hksimpson
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