P2243

274E - P2243

Information saved in
DME

Fault code
274E - P2243

Fault text
Oxygen sensor fault Nernst cable before catalytic converter,
bank 1

Fault description
O2 Sensor Reference Voltage Circuit/Open (Bank 1 Sensor
1)

Condition for fault identification
Test condition:
* Query to controller at MIN limit with oxygen sensor cold
(heater error) => leads to oscillator deactivation
* Oxygen sensor voltage checked for level below the
threshold 98 mV (K_LAVK_OBD_PLAU_UN_SCHW)
Terminal condition: Engine running - Condition idle or part-
load
Voltage condition:
none

Condition for fault memory entry
none

Action in service
1. Check plug and wiring harness on pre-cat oxygen sensor
LSVK B1 (especially UN for Nernst cell voltage supply),
2. If OK, replace oxygen sensor

Fault effect and breakdown warning
MIL lamp on after engine runs 2x /Small influence on
drivability

Driver information
Warning light:
MIL

Service instruction
none