Engine Controls System: 2742

2742 - P0135

Information saved in
DME

Fault code
2742 - P0135

Fault text
Oxygen sensor heater resistance diagnosis before cat.
converter, bank 1

Fault description
O2 Sensor Heater Circuit (Bank 1 Sensor 1)

Condition for fault identification
Test condition:
The upper or lower threshold of the resistance values has
been violated, above/below 6.0 ohms
(K_LSHVK_DIAG_RU) 14.5 ohms
(K_LSHVK_DIAG_RO)
Terminal condition: Engine running
Voltage condition:
Battery voltage > 9V (k_ed_ubmin)

Condition for fault memory entry
min. K_LSHVK_DIAG_ANZ_MESS (100) valid
calculations of heater resistance - roughly.1.5 sec.

Action in service
1. DME software release must be more recent than 07-06-
510, fix incorporated since 07-09-521
2. Check plug, wiring harness on pre-cat oxygen sensor
LSVK B1,
3. 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