P2245
P2245Oxygen Sensor Ahead of Catalytic Converter, Bank 1 - Nernst Voltage Line - Below Limit
Diagnostic conditions
- Battery voltage between 10 V and 16 V
- Time after the engine is started longer than 10 seconds
Possible cause of fault
- Check Nernst voltage line for short circuit to ground
- Oxygen sensor faulty (internal short circuit or intercore short circuit)
- DME control module faulty
Affected terminals
DME control module connector A, pin 70, oxygen sensor connector ahead of TWC, bank 1, pin 1
Diagnosis/troubleshooting
NOTE: Do not use contact spray on the oxygen sensor plug connections as this may cause irreparable damage to the wiring (contamination of the oxygen sensor via the reference air channel).
NOTE: Do not confuse oxygen sensor ahead of catalytic converter and oxygen sensor behind catalytic converter as this will cause implausible fault entries.
Distinguishing feature of both sensors:
Oxygen sensor in front of catalytic converter (LSU) has a six-pin connector
Oxygen sensor behind catalytic converter (LSF) has a four-pin connector
NOTE: If connector A is disconnected from the DME control module and the ignition is or was switched on, the 'DME Control Module TIMEOUT' fault is recorded in many control modules.
NOTE: If control module connector A was disconnected from the DME in the course of troubleshooting or if the voltage supply was interrupted elsewhere (battery, fuse), the throttle adjusting unit must be adapted.
