P2098
P2098Oxygen sensor ahead of catalytic converter, bank 2 - above limit
Diagnostic conditions
- Exhaust temperature between 250 °C and 750 °C
- Battery positive voltage between 10 V and 16 V
- All 4 oxygen sensors ready for operation
- Travelling, partially loaded, for approx. 20 minutes or short test
Possible cause of fault
- Leak in exhaust system between the two oxygen sensors on bank 2
- Oxygen sensor ahead of catalytic converter, bank 2 faulty (old)
- Inlet camshaft adjustment fault
- Mechanical fault in valve drive
Affected terminals
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Diagnosis/troubleshooting
NOTE: This fault means that the oxygen sensor behind the catalytic converter has detected a difference in the mixture that was not detected by the oxygen sensor ahead of the catalytic converter.
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).
- 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 ahead of catalytic converter (LSU) has a six-pin connector
Oxygen sensor behind catalytic converter (LSF) has a four-pin connector
