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I have two codes on my 2008 gmc sierra sle 5.3 liter

\015 The codes are p0036 and p0054\015 Posted / edited by AnonymousUser on : 22-01-2018

Answers :

Both codes are for the O2 sensor bank 1 sensor 2 which is after the cat converter. Code 54 is for the heater in the sensor which could cause code 36 if the heater is not working.
There may be a problem with the sensor or the power source for the heater. The sensor is heated at start-up to quickly read the exhaust gases.
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