P0157

272B - P0157

Information saved in
DME

Fault code
272B - P0157

Fault text
Oxygen sensor, electrical diagnosis, behind cat., Bank 2

Fault description


Condition for fault identification
Test condition:
* Sensor heater must be active since at least
K_LSHNK_AKTIV_T *Exhaust-gas temperature >
K_LANK_DIAG_TKat *LA controller is active since
K_LANK_DIAG_VK_REG_T
*Sensor temperature > K_LANK_DIAG_SONDTEMP
*catalyst temperature > K_LANK_TKat_SCHW
Terminal condition: Engine running
Voltage condition:
ub > K_ED_PlusMin

Condition for fault memory entry
Sensor voltage lank_us_b2 <
K_LANK_DIAG_UMin for min.
K_LANK_DIAG_GND_T

Action in service
1. Check plug and wiring harness to post-catalyst oxygen
sensor behind Bank 2 catalyst
2. If OK, replace oxygen sensor

Fault effect and breakdown warning
MIL lamp lights up after engine runs 2X

Driver information
Warning light:
No

Service instruction
none