P0138

2A7C - P0138

Information saved in
DME

Fault code
2A7C - P0138

Fault text
Oxygen sensor after catalytic converter, electric

Fault description
Post-catalyst oxygen sensor, electric

Condition for fault identification
Test condition:
Engine running
Terminal condition: Terminal 15
Voltage condition:
Onboard electrical system voltage ubsq > 10.7 V

Condition for fault memory entry
6 sec.

Action in service
Check wiring harness
Replace oxygen sensor

Fault effect and breakdown warning
It is possible to continue driving. Because the oxygen sensor
cannot be used for closed-loop control the exhaust emissions
will exceed the official limits.
none

Driver information
Warning light:
MIL ON

Service instruction
None