Oxygen sensor heater circuit fault — bank 1 sensor 1

What the code means

The controller detected an electrical or performance fault in the specified heater circuit.

Severity and driving

Service soon

Plausible causes

Open heater element
Wiring or connector damage
Fuse/power supply issue
Controller driver fault

Next checks

Do not test live wiring without correct service information
Inspect only visible harness damage with vehicle off
Use model-specific wiring and electrical tests

Source and boundary

Code structure follows SAE J2012. Manufacturer-specific definitions, pinpoint tests, wiring, torque, fluids, and repair procedures require authoritative information for the exact vehicle.

SAE J2012 Diagnostic Trouble Code DefinitionsReviewed 2026-08-13

Link this code to a diagnosis