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BBH02S22 Codes P0161 & P0157

This is a discussion on BBH02S22 Codes P0161 & P0157 within the Computer & Tuning forums, part of the LSx Technical Help Section category; Hi guys I am new to the site. I recently got a 2002 Pontiac Trans Am WS6. It is all ...

  1. #1
    Junior Member
    Join Date
    Oct 2009
    Arlington, TX

    2002 Pontiac Trans AM WS6

    BBH02S22 Codes P0161 & P0157

    Hi guys I am new to the site. I recently got a 2002 Pontiac Trans Am WS6. It is all stock except for the hooker header, slp exhuast & cat. The SLP exhuast and cat where just installed in the last month and the car place it was taken too said the 02 sensors looked ok. RIGHT...Anyways i got the SES light come on shortly after i bought it. car runs fine, idles okay, but gets some terrible gas mileage. Can anyone tell me what these codes mean? I was advised to replace the 02 sensor on the passenger side pre-cat

  2. #2
    LSwut tep98ws6's Avatar
    Join Date
    Jun 2009
    Saint Louis, MO

    Arctic White & Black
    '98 WS6 M6 - SWAPTIME!

    p0161 - excessive draw or open circuit in the o2 sensor ... make sure your o2 sensor is clean first of all, that is very important with o2's ... otherwise check your wires & connection, make sure everything looks good and not touching any exhaust components - if it does, you may need an o2 sensor

    p0157 - make sure you're not having any lean conditions (check fuel PSI, MAF, no vacuum leaks, dirty air filter, ect) and check all wires/connections as well as make sure the o2 isn't dirty. this is the same o2 sensor as the first code so if all of this checks out, replace the o2

    ** if you're getting bad MPG, definitely check fuel PSI at the rails, filter and pump **
    Last edited by tep98ws6; 10-29-2009 at 09:23 AM.

  3. #3
    Senior Member
    Join Date
    Jul 2005
    Jacksonville, FL
    161 is a heater code, 157 is a low voltage code - both relate to the POST CAT sensor on the passenger side. You can look up the codes for your year at

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