2A90

2A90 - P3018

Information saved in
DME

Fault code
2A90 - P3018

Fault text
Oxygen sensor before catalytic converter, pump current
cable

Fault description
Pre-catalyst oxygen sensor, pump current cable

Condition for fault identification
Test condition:
Engine running;
Continuous lambda control enabled (B_lrs = 1)
Terminal condition: Terminal 15
Voltage condition:
none

Condition for fault memory entry
3. Error paths:
1. 1.5 sec. or 1.5 sec.
2. None
3. 5 sec.

Action in service
Check wiring harness between DME and oxygen sensor in
front of catalyst; I_LSVP1
Replace oxygen sensor in front of catalyst

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.
MIL lights up
Higher exhaust emissions
Increased fuel consumption
Surge

Driver information
Warning light:
MIL ON

Service instruction
None