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P0141

O2 sensor heater circuit malfunction (Bank 1 Sensor 2)

The ECU has detected an electrical fault in the heater circuit for the downstream Bank 1 oxygen sensor.

What this code means

The ECU has detected an electrical fault in the heater circuit for the downstream Bank 1 oxygen sensor.

Possible causes

  • Failed sensor heater
  • Blown fuse
  • Open or short circuit in heater wiring
  • Connector corrosion

Common symptoms

  • Check engine light
  • Slow sensor warm-up
  • Usually little immediate driveability change

Checks to make

  1. Check related fuses
  2. Inspect wiring and connector
  3. Measure heater resistance and supply according to manufacturer data

Safety

  • Do not replace parts from the code alone. Confirm the fault with live data, wiring checks and manufacturer procedures. Keep clear of hot or moving engine components.

Model notes

The code definition is generic; exact diagnostic thresholds, component locations and repair procedures vary by vehicle.