Troubleshooting- A Few Scan Codes...

Discussion in 'General Chevy & GM Tech Questions' started by Fraterado1855, Jun 16, 2012.

  1. Fraterado1855

    Fraterado1855 New Member


    Wasn't able to scan but found some faulty wiring and blown fuses, now I've got the following:

    Print out:
    Read but unable to print:

    Looks like a root cause for many of these is a poor oxygen sensor, which I have 4 of. Is there any way to troubleshoot which sensor, or am I about to go drop $65 a pop on 4 new Bosch O2 sensors?

    Let me know what you think. I'm currently working on a flush of the transmission system.

    FYI (Moderators): I'm new to the site so if this should go in a different thread/section, please move or advise.


    99'HEARTBEAT MODERATOR Staff Member 5+ Years ROTM Winner 1000 Posts Platinum Contributor

    TJ......Hope some of the Below Infor. can help you out??

    ......Code a Random Misfire
    ......Code P0141.......Is an Issue/Problem with the 02 on Bank 1 Sensor 2, Which is on the Driver Side, after the Catalytic Converter.
    ......Code P0161.......
    Is an Issue/Problem with the 02 on Bank 2 Sensor 2, which is on the Passenger Side, after the Catalytic Converter.

    Edit....****Moved Thread to General Tech Q&A Section****
    Last edited: Jun 16, 2012
  3. MrShorty

    MrShorty Epic Member 5+ Years 1000 Posts

    Both of the O2 sensor codes are for the post cat sensors, which really have no effect on driveability. The post cat sensors' sole purpose is to determine if the cats are functioning adequately.

    If the cats are plugged, that could cause problems.

    P0300 can be caused by just about anything that can cause a misfire, including, but not limited to fuel delivery issues, spark plug/ignition issues, compression/valve train/mechanical condition issues, and so on.

    My code list doesn't go below P0100, and shows P0286 as a problem on cylinder 9, so I'm not sure what to make of those codes, P0281 is a problem with cylinder 7 (similar to the P0300 code except specific to cylinder 7).

    At this point, I'm not sure the codes by themselves are helping us a lot. I might put a vacuum gauge on it to see if clogged cats are indicated by the cat codes. What kind of driveability symptoms/problem are you diagnosing?
  4. Fraterado1855

    Fraterado1855 New Member

    I just finally fixed the OBD II diagnostic port plug and wanted to try and get everything in working order. The track stumbles at start-up (worsens with higher outdoor temperature) and I figured since I now know the codes I should do something about them.

    I originally started this weekend to do some transmission work due to late shifts, which has turned out to be a bit rough.. I'll make a separate post on that.

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