O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
The ECU detects an electrical fault in the heater circuit of the downstream O2 sensor on bank 2. Heater current out of range — open or shorted heater element, blown fuse, or wiring fault.
Affected components
- Oxygen sensor b2s2
- Oxygen sensor heater fuse
- Oxygen sensor heater wiring
Common causes
- High likelihood: Heater element open
- Medium likelihood: Heater fuse blown
Possible symptoms
- Check engine light on after several drive cycles
- Slightly increased fuel consumption during cold start
- Delayed entry into closed-loop fuel control
- Failed emissions inspection (lambda readiness)
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.