P0141 moderate

O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)

What does P0141 mean?

The P0141 code means the vehicle's onboard diagnostic system has detected: O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2). This is a moderate severity code.

Common Symptoms

  • Check Engine Light on
  • No drivability issues in most cases
  • Possible interference with catalytic converter monitoring

Probable Causes (Ranked by Likelihood)

  • Failed downstream O2 sensor heater element Very High
  • Blown heater circuit fuse Moderate
  • Wiring fault to downstream sensor Moderate

Step-by-Step Diagnostic Procedure

  1. Check fuse for downstream O2 heater circuit.

  2. Test heater resistance at the downstream sensor: 3-15 ohms typical.

  3. Verify voltage supply and ground at the sensor connector.

  4. Replace sensor if heater element is open.

Frequently Asked Questions

Will P0141 affect my catalytic converter monitor?

Yes. If the downstream O2 sensor is not reaching operating temperature quickly, the catalyst efficiency monitor (P0420) may not run or may give inaccurate results. Repair P0141 first before diagnosing a potential P0420.

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