02 Sensor Heater Circuit

Start by getting the car up on some safety stands then roll underneath it with a.

02 sensor heater circuit. As the o2 heater reaches operating temperature the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. O2 sensor heater circuit malfunction bank 1 sensor 1 what the p0135 code means. The pcm monitors the heater circuit and will turn on the check engine light if it finds a problem. If the engine control module detects that the oxygen sensor heater circuit is open short or draws too much current based on coolant temperature the onboard computer will output obd ii diagnostic trouble code p0135.

Bank 1 refers to the side of the engine that has the 1 cylinder. Test the circuits of the oxygen sensor harness connector which is the connector on the engine wiring harness. P0135 is the obd ii generic code indicating the engine control module ecm has tested the o2 sensor heater circuit and has detected a problem with the bank 1 sensor 1 o2 sensor heater circuit. Usually the heater circuit in this case is controlled by a relay.

If the o 2 sensor heater circuit s negative wire goes directly to ground look for a short to power problem. Test 1 testing for 12v to oxygen heater. The heater circuit is energized through a relay that closes when the engine is cranked. This code indicates that the engine control module ecm has tested the oxygen sensor heater circuit and has found a problem with sensor 1 in bank 1.

The o 2 sensor s heater circuit is controlled in one of two ways. Power comes from 10v to 12v from the oxygen sensor fuse in the compartment fuse box of the engine. First is the positively controlled type of circuit. Start by making sure the oxygen heater sensor gets power.

Diagnostic trouble code dtc p0161 stands for o2 sensor heater circuit malfunction bank 2 sensor 2 it warns about an issue with the bank 2 sensor 2 oxygen o2 sensor s heater circuit. This indicates the pcm has detected a problem with the bank 1 oxygen sensor. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. Sensor 2 is the downstream sensor in the catalytic converter smack in the middle of the underside of the car.

The number 0135 points toward the heated oxygen sensor circuit specifically bank 1 sensor 1. Remove the relay and retest the circuit. The onboard diagnostic obd code p0135 is an oxygen sensor heater circuit malfunction in bank 1 sensor 1.