P0036
P0036Oxygen Sensor Heating Output Stage After TWC, Bank 1 - Open Circuit
Diagnostic conditions
- Battery voltage between 10 V and 16 V
- Time after the engine is started longer than 10 seconds
Possible cause of fault
- Fuse FE18 faulty (fuse carrier in E-box, radiator tank)
- Loose contact in connector
- Break in wiring in voltage supply of oxygen sensor heating
- Break in wiring in connection to ground of oxygen sensor heating
- Oxygen sensor heating faulty (heating resistance too high)
- DME control module faulty
Affected pins
DME control module connector A, pin 63, and oxygen sensor connector after TWC, bank 1, pin 2
Diagnosis/troubleshooting
NOTE: Do not use contact spray on the oxygen sensor plug connections as this may cause irreparable damage to the wiring (contamination of the oxygen sensor via the reference air channel).
NOTE: Do not confuse oxygen sensor ahead of catalytic converter and oxygen sensor behind catalytic converter as this will cause implausible fault entries.
Distinguishing feature of both sensors:
Oxygen sensor in front of catalytic converter (LSU) has a six-pin plug
Oxygen sensor behind catalytic converter (LSF) has a four-pin plug
NOTE: If connector A is disconnected from the DME control module and the ignition is or was switched on, the 'DME Control Module TIMEOUT' fault is recorded in many control modules.
NOTE: If control module connector A was disconnected from the DME in the course of troubleshooting or if the voltage supply was interrupted elsewhere (battery, fuse), the throttle adjusting unit must be adapted.
