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o2 help

This is a discussion on o2 help within the Computer & Tuning forums, part of the LSx Technical Help Section category; i have an aeroforce tech gauge. o2 1 is working good its jumping around o2 2 is pretty much steady ...

  1. #1
    Junior Member
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    Apr 2008
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    Pewter Silver
    2002 T/A

    o2 help

    i have an aeroforce tech gauge. o2 1 is working good its jumping around o2 2 is pretty much steady at 440 mv and o2 3 is jumping around. there is no o2 4 for me to choose for the gauge to read. i know i have 4 o2's. so what i did is unplug one see what the gauge reads when i did driver upstream it made o2 1 steady at 440. then i did driverside down stream that made no diff on the read outs. so i figured that one to be bad but i still did the passenger side just to be sure. pass upstream made o2 3 steady at 440 and pass downstream nothing. so i got a new downstream sensor to see if it would change the o2 2 read out. i put it in it didn't change o2 2 readout. Where am i going wrong? not throwing any code. the reason why im concerned is cause when i pull it out the garage she runs a lil ruff. when she hit about 100 on the temp shes smooth. i leave when she' s about 110 temp she runs like a beast for like 1 mile then she feels like she lost 50hp after that. you feel a big differance. so i noticed a sulfur smell so i looked on here and people told others that it was most likely a bad o2. so i started looking at my readouts. please help finely off for a weekend. won't get time for probly another month.

  2. #2
    Veteran 0rion's Avatar
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    98 Formula
    06 duramax

    well, I'm not exactly sure with how you're reading those O2's. Most gauges will call them B1S1(Bank1 Sensor1),B1S2(B1Sensor2), B2S1(Bank2Sensor1),B2S2(Bank2Sensor2). Bank 1 is the drivers side and Bank 2 is the passenger side. Sensor 1 is pre-cat and sensor 2 is post cat. Usually a steady 450mv is a flatlined sensor. I guess your main issue is figuring out what they're calling sensor 2. The front sensors control fueling so I would look at those.

  3. #3
    Junior Member
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    Pewter Silver
    2002 T/A

    sensor 1 is drivers front sensor 2 has to be the one after the cat but don't know what side and sensor 3 is pansenger front the damn gauge doesn't give me a choice to read on a forth sensor

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