P2297

2728 - P2297

Information saved in
DME

Fault code
2728 - P2297

Fault text
Oxygen sensor, coast mode diagnosis, before cat., Bank 1

Fault description


Condition for fault identification
Test condition:
* Engine temperature > K_LAVK_OBD_TMOT *Sensor
temperature > K_LAVK_OBD_VK_TEMP * since
recognition of overrun an air mass a flow of
K_LAVK_OBD_SA_ML_SUM must have occurred
Terminal condition: Engine running - status overrun cutoff
Voltage condition:
none

Condition for fault memory entry
Oxygen sensor is available (through sensor temperature, no
DTCs, etc.) but the AD value is less than
K_LAVK_OBD_SA_SCHW for the number
K_LAVK_OBD_SA_CNT of measurements

Action in service
1. Check plug and wiring harness to Bank 1 pre-catalyst
oxygen sensor (focus on opens in wires for virtual ground
and pumping current)
2. Replace oxygen sensor

Fault effect and breakdown warning
MIL lamp lights up after two driving cycles

Driver information
Warning light:
No

Service instruction
none