P0147 Code - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 3
Quick Answer
The rear heated oxygen sensor (or sensor 3 for some vehicles), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include Faulty Heated Oxygen Sensor Bank 1 Sensor 3, Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 3 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0147 indicates O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 3.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor Bank 1 Sensor 3, Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 3 circuit poor electrical connection.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P0147 Description
This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 3 is not used for engine control operation.
What are the Possible Causes of the DTC P0147?
- Faulty Heated Oxygen Sensor Bank 1 Sensor 3
- Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted
- Heated Oxygen Sensor Bank 1 Sensor 3 circuit poor electrical connection
How to Fix the DTC P0147?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0147 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0147 code?
Need more information on how to fix the P0147 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0147 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- P0147 Buick — HO2S Heater Circuit Bank 1 Sensor 3
- P0147 Cadillac — HO2S Heater Circuit Bank 1 Sensor 3
- P0147 Chevrolet — HO2S Heater Circuit Bank 1 Sensor 3
- P0147 Ford — O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 3
- P0147 GMC — HO2S Heater Circuit Bank 1 Sensor 3
- P0147 Mercedes-Benz — O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 3
- P0147 Pontiac — HO2S Heater Circuit Bank 1 Sensor 3
- P0147 Saturn — HO2S Heater Circuit Bank 1 Sensor 3
- P0147 Volkswagen — O2 Sensor Heater Circuit Bank 1 Sensor 3
Frequently Asked Questions about P0147 Code
No Frequently Asked Questions about P0147 Code found.
Discuss the causes and fixes for P0147 OBDII Code
-
Question: the symptoms section says you get decreased fuel economy with code p0147, which I have, that code and decreased fuel economy. But it goes on to say that this sensor is not used as engine control. So which is it?
-
The heated part of the O2 sensor it's not used for engine control under 'normal' temperatures.
If the engine is cold the ECM will activate the heater part of the O2 sensor to warm up the O2 sensor (O2 sensor works better once is warm up). If the heater part of the sensor is not working properly, it will take longer for the O2 sensor to warm up, thus making the engine run longer on open loop. Open loop means engine rpm may stay higher than normal.
Read about Open Loop: https://www.autocodes.com/art...
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
