P0147 OBD-II: O2 Sensor Heater Circuit
P0147 Severity
Will P0147 go away on its own?
Once the vehicle's onboard system no longer detects the issue, most codes will disappear on their own. If your vehicle still has this code, however, it should be properly diagnosed to avoid a more serious problem.
For a proper diagnosis, RepairPal Certified shops have the equipment, tools, and expertise.
Moderate severity codes might not threaten the vehicle's safety or functionality immediately, but you should still get it diagnosed within a reasonable time frame to keep your car running well.
What causes OBD-II fault code P0147?
The purpose of the oxygen sensor is to measure the oxygen content in the exhaust gases after they leave the combustion process of the engine. The oxygen sensor must be at a certain temperature in order for this information to be accurate. The oxygen sensor has a heater wire inside to help bring the sensor up to temperature quicker. When the PCM detects the heater wire is not operating, it will set code P0147.
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What Does P0147 Code Mean?
Fault Code Definition
The Rear Catalyst Monitoring Oxygen Sensor evaluates the rear most Catalytic Converter's emissions-reducing capability in a system with two Catalytic Converters for each bank of cylinders. P0147 is set when the Rear Oxygen Sensor signal does not show closed loop fuel system operation within the required time.
P0147 Symptoms
- Check Engine Light will illuminate
- In many cases, no abnormal symptoms may be noticed
- In some cases, the vehicle will fail an Emissions Test
- In many cases, the NOx emissions will be elevated
Common Problems That Trigger the P0147 Code
- Defective Rear Most Oxygen Sensor
- Faulty Rear Most Oxygen Sensor wiring or connections
Common Misdiagnoses
- Oxygen Sensor is replaced when the problem is faulty sensor wiring or connections
- Rear Catalytic Converter or Rear Oxygen Sensor is replaced when the problem is an exhaust leak before the Rear Oxygen Sensor
Ask our experts about P0147.
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