Engine Controls System: 118602

118602 - P2096

Information saved in
DME

Fault code
118602 - P2096

Fault text
Oxygen sensor before catalytic converter, fine mixture
control: exhaust gas after catalytic converter too lean

Fault description
The diagnostic function monitors the oxygen sensor behind
the catalytic converter to determine whether it displays a
consistent deviation.

Condition for fault identification
Test condition:
The fault is recognized when the trim control on the oxygen
sensor behind the catalytic converter exceeds a level of
positive 4%.
Potential problem source(s):
- Defective wiring harness
- Leak in exhaust system on engine-side of catalytic
converter
- Oxygen sensor before catalytic converter defective
- Oxygen sensor behind catalytic converter defective
- Defective DME
Terminal condition: none
Voltage condition:
- Onboard electrical system voltage between 9 V and 16 V
Temperature condition:
- Engine warmed to normal temp, above 80 °C
Time condition:
- None
Other conditions:
- Engine on
- Drive at a constant speed between 50 and 80 km/h at
moderate rpm (1400 to 3240 rpm).
- No faults that would cause mixture faults are registered.

Condition for fault memory entry
The diagnostic fault code is logged when the fault remains
present for longer than 10 min.

Action in service
- If faults related to mixture control are present repair these
first
- Conduct system test for oxygen sensors in wrong mutual
positions
- Check muffler unit before oxygen sensor behind catalytic
converter for leaks
- Check wiring harness between oxygen sensor and DME
- Replace pre-catalyst oxygen sensor
- Replace oxygen sensor behind catalytic converter
- Replace DME

Fault effect and breakdown warning
Breakdown notice:
Continued driving is possible, but because the oxygen
sensor is not ready for closed-loop control, conversion of
exhaust gases in the catalytic converter will be seriously
impaired.
Possible apparent symptoms:
- MIL lamp lights up after 2nd driving cycle
- Higher exhaust emissions
- Higher fuel consumption
- Surge

Driver information
Warning light:
- ECE emissions warning lamp: on
- ECE electronic engine power reduction: on
- CC message: on
- US emissions warning lamp: off
- US electronic engine power reduction: off
- CC message: none

Service instruction
None