i have a 2000 sierra and the engine light is on and the code is p0137: 02 sensor circuit low voltage ( bank 1 sensor 2). can you tell me where this is or how to replace it. thanks

That is the O/2 sensor after the converter. It's likely a bad sensor but could also be a leak in the exhaust before the sensor introducing air into the converter.




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thanks hammertime, will check it out.

To add: If in a rust belt the wires can fail at sensor! Can't really fix that if the pulled out - replacement is best and OE grade seems to last longer on the dang things!

T
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Tom Greenleaf - MetroWest, Boston