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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 02-13-2010, 07:10 PM
04 Green EXT 04 Green EXT is offline
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2004 Chevy TrailBlazer LS EXT
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Need More Info P0136

Had a good looken girl (Sweet) form AutoZone scan my TB and got this:

P0136 Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)

OK...after searching this code, I know the this is a O2 sensor problem, but can anyone tell me for sure which sensor is 2. I am assumeing that it is post convertor but I just want to make sure.
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Old 02-14-2010, 01:04 AM
BTMinn BTMinn is offline
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O2 Sensor 1 is before the catalytic converter and 2 is after.

See this post http://forums.trailvoy.com/showthread.php?t=58900 Location of the sensors is discussed in post #4
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Old 02-14-2010, 02:08 AM
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Knightslugger Knightslugger is offline
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Sensor two is post Catalytic Converter.

Replace with a AC Delco brand unit.
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Old 02-14-2010, 06:44 AM
04 Green EXT 04 Green EXT is offline
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thanks, that is what I thought but I just wanted to make sure.
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