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P0420 GMC -
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asked
Dec 6, 2017
by
anonymous
help me with o2 sensor codes
Vehicle:
2008, GMC, Envoy and 6
check-engine-light-on
p0420
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1
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answered
Dec 26, 2017
by
Carguy1
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13.5k
points)
Hi there,
This is not an O2 sensor code. This is a code for the bank 1 catalytic converter below threshold. This usually indicates there is a problem with the converter and it must be replaced to resolve the issue. If the problem is being caused by the rear O2 sensor, then you need a scan tool that can read the live data to confirm it. Normally you will not get a code for the converter when the sensor is the problem.
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