P0147O2 Sensor Heater Circuit Bank 1 Sensor 3
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Sensor 3 is a third oxygen sensor on bank 1, behind a second converter or converter brick. It only exists on some vehicles – documented for Jaguar Land Rover's 3.0 V6 supercharged (2013–2016, where sensor 2 is 'mid-cat' and sensor 3 'post-cat') and Ford systems that monitor part of the converter volume. P0147 concerns its heater. Ford checks the driver voltage continuously and the heater current once per drive cycle once sensor 3 is above about 120 °C and has heated for 30 s – below about 0.22–0.465 A (depending on supplier) or above 3 A counts as a fault; the heater resistance is a separate code (P0055). Jaguar Land Rover lists P0147 for its post-cat sensor. When it fails, the control module stops the downstream trim and cannot evaluate the converter; there is no limp mode.
- What you may notice
- Check engine light on (usually after two drive cycles)
- Follow-up codes for sensor 3 possible
- Usually no noticeable change in driving
- Likely causes
- LikelyHeater element in the sensor burnt out (replace sensor)
- PossibleHeater supply (fuse, relay) or control wire open
- RareConnector corroded, contact resistance
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €50 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.