02 Sensor Heater Circuit

First is the positively controlled type of circuit.

02 sensor heater circuit. Remove the relay and retest the circuit. The number 0135 points toward the heated oxygen sensor circuit specifically bank 1 sensor 1. Test the circuits of the oxygen sensor harness connector which is the connector on the engine wiring harness. Power comes from 10v to 12v from the oxygen sensor fuse in the compartment fuse box of the engine.

Start by getting the car up on some safety stands then roll underneath it with a. Modern oxygen sensors come with heating elements so that they heat up to the ideal operating temperature quickly. The o 2 sensor s heater circuit is controlled in one of two ways. Code p0030 stands for oxygen o2 sensor heater circuit malfunction bank 1 sensor 1.

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. The pcm monitors the heater circuit and will turn on the check engine light if it finds a problem. As the o2 heater reaches operating temperature the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. 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. 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. Start by making sure the oxygen heater sensor gets power. Sensor 2 is the downstream sensor in the catalytic converter smack in the middle of the underside of the car.

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. Test 1 testing for 12v to oxygen heater. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. The ecm tracks how long it takes for the oxygen sensor to begin switching.

The onboard diagnostic obd code p0135 is an oxygen sensor heater circuit malfunction in bank 1 sensor 1. O2 sensor heater circuit malfunction bank 1 sensor 1 what the p0135 code means. 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.