02 Heater Circuit

Remove the relay and retest the circuit.

02 heater circuit. 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. First is the positively controlled type of circuit. Water getting inside the heated oxygen sensor connector can cause the. The o 2 sensor s heater circuit is controlled in one of two ways.

As the o2 heater reaches operating temperature the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. 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. Diagnostic trouble code dtc p0155 stands for o2 sensor heater circuit malfunction bank 2 sensor 1 it is triggered when the vehicle s computer or the engine control module ecm detects an unexpected voltage condition or excessive current draw on the heater circuit of your vehicle s bank 2 ho2. Test the circuits of the oxygen sensor harness connector which is the connector on the engine wiring harness.

Modern oxygen sensors come with heating elements so that they heat up to the ideal operating temperature quickly. Test 1 testing for 12v to oxygen heater. Usually the heater circuit in this case is controlled by a relay. This diagnostic trouble code dtc is a generic powertrain code which means that it applies to obd ii equipped vehicles.

Power comes from 10v to 12v from the oxygen sensor fuse in the compartment fuse box of the engine. Oxygen o2 sensor heater circuit malfunction bank 1 sensor 1 what does that mean. Sensor 2 would be the second sensor downstream from the engine. The code means that there is a problem with the heater element circuit of the heated oxygen sensor.

Although generic the specific repair steps may vary depending on make model. 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. O2 sensor heater circuit malfunction bank 1 sensor 1 what the p0135 code means. If the o 2 sensor heater circuit s negative wire goes directly to ground look for a short to power problem.

The code is triggered when the sensor is taking too long to warm up. The number 0135 points toward the heated oxygen sensor circuit specifically bank 1 sensor 1.