Defect Code 28

Defect code 28:

•D• 900 Defect code memory: 28 Oxygen sensor:

Explanation: This defect code is stored when a short or a break occurs at the oxygen sensor or on its supply wires, or when no oxygen sensor is installed (Cat provision). A prerequisite for this is an engine temperature of 70° C and a load signal of > 3.5 ms for> 20 sec.

Troubleshooting: As displayed on screen. For oxygen sensor test values, refer to - Component Testing -.
Oxygen Sensor