P0147 code meaning
O2 Sensor Heater Circuit Bank 1 Sensor 3
Powertrain system Generic code P01xx codes Check engine light
What P0147 means
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.
P0147 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.2 to 1 hours
- Clears after repairAfter a drive cycle
Symptoms of P0147
- Check engine light on (usually after two drive cycles)
- Follow-up codes for sensor 3 possible
- Usually no noticeable change in driving
Common causes of P0147
- Most likelyHeater element in the sensor burnt out (replace sensor)
- PossibleHeater supply (fuse, relay) or control wire open
- Less likelyConnector corroded, contact resistance
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Oxygen sensor heater bank1 sensor3Oxygen sensor heater circuitFuses
What each part of P0147 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 1 | Area: fuel and air metering. |
| 47 | The exact fault in that area. |
What to do next
- Note P0147 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0147
What does P0147 mean?
P0147 means "O2 Sensor Heater Circuit Bank 1 Sensor 3". Sensor 3 is a third oxygen sensor on bank 1, behind a second converter or converter brick. It is a generic code, so it means the same on every make.
Is it safe to drive with P0147?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0147 fail an emissions test?
Yes, it can. P0147 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0147 to fix?
Difficulty: easy. A typical repair takes 0.2 to 1 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0147 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.