2AC4

2AC4 - P2196

Information saved in
DME

Fault code
2AC4 - P2196

Fault text
Oxygen sensor before catalytic converter, plausibility

Fault description
Pre-catalyst oxygen sensor, plausibility

Condition for fault identification
Test condition:
Active post-catalyst closed-loop control
value for post-catalyst control dlatrmo_w > 0.07
Terminal condition: Terminal 15
Voltage condition:
none

Condition for fault memory entry
offset recognition is active > 60 sec.

Action in service
Check plug connections between pre-catalyst sensor and
wiring harness,
check plug connections between post-catalyst sensor and
wiring harness,
otherwise replace pre-catalyst oxygen sensor

Fault effect and breakdown warning
None
MIL lights up when fault is detected in two consecutive
driving cycles

Driver information
Warning light:
MIL ON

Service instruction
None