P320C/012812

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P320C/012812 - Oxygen (Lambda) Sensor B1 S1/S2: Lean Correlation

Possible Causes

  • Exhaust Leak before O2 Sensor
  • False air leak in the intake system after the MAF sensor
  • Failed O2 Sensors

Possible Solutions

  • Repair exhaust Leak before O2 Sensor
  • Repair false air leak in the intake system after the MAF sensor
  • Replace failed O2 Sensors
  • Reset O2 Sensor adapted values, see notes below

Special Notes

  • When found in NAR 2009 - 2010 Volkswagen Jetta with a 2.0L TDI CBEA or CJAA, a new ECM software version is available, please see:
    • TSB 23-11-01
    • TPI 2025546
    • Required Vehicle Update – 23H1


  • Check Measuring Value Blocks (CBEA/CJAA) Group 041-(B1S1) and 136-(B1S2) for O2 Sensor adapted values
    • Normal Range is [-1.28 to 1.22] - if out of range suspect failed O2 Sensors
      • To reset the above value after a repair, disconnect the O2 sensors, cycle the ignition on/off for 5 seconds and reconnect O2 sensors, clear codes and check MVB data again.
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