P0044: O2 Sensor Heater Control Circuit High — Bank 1 Sensor 3
What to do
No driveability impact. Fix before an emissions test.
What this code means
Voltage on the bank 1 third sensor heater circuit is above the expected range, generally an open circuit or a short to supply. Corroded pins that have lost contact are the usual cause on a sensor this far back; clean and test before condemning the part.
Likely causes
Start here
- Corroded or loose connector · easy
- Open circuit in heater wiring · moderate
- Failed oxygen sensor heater element · easy
Less common
- Wiring shorted to voltage · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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