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P0147 is a diagnostic trouble code (DTC) for "O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 3)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 3)
P0147 is the OBD-II generic code indicating the Engine Control Module (ECM) has tested the O2 sensor heater circuit during startup and detects problems with the bank 1 sensor 3 O2 sensor heater circuit.
The ECM tests the O2 sensor heater circuits at startup for excessive current draw, opens, or shorts. In the case of the P0147 code, the ECM detects a short, open, or excessive current draw in the O2 bank 1 sensor 3 heater circuit.
The engine will not run any different, since the O2 sensor is only used for catalyst efficiency and not for fuel control.
The Check Engine Light will be illuminated by the ECM after the O2 sensor fails the test.
Follow these simple guidelines to prevent misdiagnosis:
Check the O2 sensor wire harness cover for contaminants entering into the covering that can short the sensor heater circuit.
Check the O2 sensor for oil or coolant contaminants that can short the sensor.
The code will not affect the way the engine will run if the sensor is the fault of the code. The O2 sensor 3 for bank 1 is only used to check catalyst efficiency.
The code will cause a failure for emission testing due to the Check Engine Light being on, and catalyst monitors not passing.
Replacing the O2 sensor for bank 1 sensor 3
Repairing or replacing the wiring or connection to the O2 sensor for bank 1 sensor 3
Replacing the fuse to the heater circuit for the O2 sensor heater circuit
The O2 sensor heater circuit for bank 1 sensor 3 is used to heat the internal sensor of the O2 sensor so the sensor can start working faster and be more sensitive than sensors without the heater.
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