Condition For Fault Memory Entry - 2

2CA6 - P0135

Information saved in
DME

Fault code
2CA6 - P0135

Fault text
Oxygen sensor heating before catalytic converter, function

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

Condition for fault identification
Test condition:
Examination of oxygen sensor heater, oxygen sensor fails to
reach operating temperature after start, no fault codes logged
in fault memory
Terminal condition: Terminal 15, engine on

Condition for fault memory entry
O2 sensor temperature of 650 °C not reached by 30 sec.
after engine start

Action in service
1. Visual inspection of wires, DME plug and O2 sensor for
damage
2. Check wires (including resistance)
3. Check plug-in connections DME <=> Wiring harness
<=> Upstream (pre-cat) O2 sensor on Bank 1 (water or
corrosion in the plug? => Repeatedly disconnect the plug
and then FIRMLY press it back in)
4. Replace O2 sensor
5. Replace DME

Fault effect and breakdown warning


Driver information
Warning light:
MIL ON

Service instruction
none