277C - P2097 (DME)

277C - P2097

Information saved in
DME

Fault code
277C - P2097

Fault text
Oxygen sensor trim control diagnosis, bank 1

Fault description
Post Catalyst Fuel Trim System Too Rich (Bank 1)

Condition for fault identification
Test condition:
LEAN suspected under consideration of I-component (( 2
(K_LA_TRIM_DIAG_I_MIN_SCHW) recognition of I-
component limit) leads to deliberate RICH/LEAN control
activation;
If the pre-catalyst and post-catalyst oxygen sensors respond
accordingly a trim control error is recognized.
Terminal condition: Engine running
Voltage condition:
none

Condition for fault memory entry
none

Action in service
1) Check intake and exhaust systems for leaks; incl. HFM
operation/ ..if no fault is present.. 2.) Conduct oxygen sensor
test routine/ 3.) If the test does not produce any results and
the trim control error is still present ->Replace the sensor
before the catalytic converter

Fault effect and breakdown warning
MIL on after engine runs 2x / no effects on drivability

Driver information
Warning light:
MIL

Service instruction
none