Powertrain, generic · Fuel and air metering

P0147 O2 Sensor Heater Circuit Bank 1 Sensor 3

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Heater element in the sensor burnt out (replace sensor)
Heater supply (fuse, relay) or control wire open
Connector corroded, contact resistance

Symptoms

  • Check engine light on (usually after two drive cycles)
  • Follow-up codes for sensor 3 possible
  • Usually no noticeable change in driving

Repair estimate

DifficultyEasyDIY possible
Parts and labour€50–250
Time0.2–1 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

oxygen sensor heater bank1 sensor3oxygen sensor heater circuitfuses

Related codes

P0042P0043P0044P0055P0141P0167

References: law.cornell.edu, newtonnet.co.uk, fordservicecontent.com, static.nhtsa.gov.