27AA - P0172 (DME)

27AA - P0172

Information saved in
DME

Fault code
27AA - P0172

Fault text
Bank 1 pre-catalyst oxygen sensor adaptation at limit

Fault description


Condition for fault identification
Test condition:
Oxygen sensor adaptation is active
Terminal condition: Engine running
Voltage condition:
none

Condition for fault memory entry
Oxygen sensor adaptation FACTOR or offset at min.
threshold K_LAA_F/OFFS_Min for the period
K_LAM_DIAG_LAA_T

Action in service
1.Check fuel system for leaks, start system test as indicated
/2. Check intake and exhaust systems for leaks. Check HFM.
/ 3. Read out oxygen sensor diagnostic data, perform both
test routines for oxygen sensors as required.

Fault effect and breakdown warning
DTC entered in DME / Engine runs erratically / Potential
collateral error: Ignition miss errores and oxygen sensor
faults

Driver information
Warning light:
No

Service instruction
none