coding PO-036, PO-138, PO-140, PO-141, PO-054 what does it mean?
P0036 02 sensor heater control circuit sensor 2
P0138 02 sensor circuit high volts Bank 1 sensor 2
P0140 02 sensor no activity detected bank 1 sensor 2
P0054 Heater resistance circuit sensor 2
This is the 02 sensor which monitors the catalytic, 02 sensor does degrade due to mileage,sensor 2 is the one behind the catalytic
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