Code P0140 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 07-09-2008, 06:05 PM
jdpap jdpap is offline
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2005 GMC Envoy SLE
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Code P0140

My check engine light came on last week, went to Autozone, code P0140 came up. Says could be oxygen sensor, could be fuel pump, or engine misfiring. Has anyone else experienced this code or have any suggestions before I spend any money to let the dealer find the problem?
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  #2  
Old 07-09-2008, 06:34 PM
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did a quick search for it on here... no results...
maybe one of the techs will chime in....

any chance it could be P0014?
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Old 07-09-2008, 07:24 PM
jdpap jdpap is offline
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No it is P0140.
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  #4  
Old 07-09-2008, 11:33 PM
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P0140- OXY SENS CIRC NO ACTIVITY DETECTED (BANK 1 SENS 2)

bad o2 sensor..check the wiring too..just in case.

(anyone correct me if i'm wrong)
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  #5  
Old 07-11-2008, 04:46 AM
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Believe it or not, there is a fuse under the hood for the oxygen sensor, I'd check there first. Something could've nicked one of the wires and shorted it out.
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Old 07-11-2008, 08:46 AM
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Quote:
Originally Posted by wardak33 View Post
P0140- OXY SENS CIRC NO ACTIVITY DETECTED (BANK 1 SENS 2)

bad o2 sensor..check the wiring too..just in case.

(anyone correct me if i'm wrong)
right on .... always connections first!
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  #7  
Old 03-11-2009, 05:19 AM
chebbyfan chebbyfan is offline
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2004 Chevy TrailBlazer LT
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Code P0140

Okay my blazer KEEPS spitting out this code. I cleaned the throttle body and put some seafoam in the tank put the negative batttery terminal back on and drove it a liitle. Everything seems fine, except that it throws the code every other day. Only thing I did different, was replaced that lower one with battery still hooked up. Don't see how that would matter though. When mine says that it says something about heat malfunction though. Btw i replaced both sensors at the same time and only the lower one is giving me fits. The sensors are new Bosch.
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Old 03-11-2009, 09:00 AM
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Blazernut Blazernut is offline
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Check out this link

http://www.obd-codes.com/p0140

Lots of info and should be helpful. (It said not to copy the pages so I gave you the link instead)
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  #9  
Old 03-20-2011, 02:58 AM
RandyS RandyS is offline
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P0140 code - books are wrong

I had been having a performance issue because the ignition timing would not go above 14 degrees. I recieved a P0140 on 2005 Chev Trailblazer LS 4.2L indicating a bad after-CAT O2 sensor. THE ODBII reader/monitor showed that the sensor reported values above 700 most of the time.

The Haynes book for the vehicle and also the Haynes book on ODB/ODBII both say that the computer uses the pre-CAT sensor to adjust timing and fuel, and that it does not use the after-CAT sensor for this. Incorrect! I replaced the only the after-CAT sensor (only change), and now the ignition timing works correctly and the vehicle performs well.
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