P1173

Read the instructions below then start the fault diagnostic procedure.

Symptom: Check Engine not on. The engine loses power to protect it against overheating.

P1173

Fault symptom

•	Check Engine not on. The engine loses power to protect it against overheating.

Conditions

The following conditions apply for the DTC in question:

•	Depending on the vehicle speed and engine oil temperature, a limit is set where max. injection quantity is decreased. The higher the temperature and the lower the vehicle speed the greater the reduction in power. The function takes effect at an engine oil temperature of 150°C (302°F).

Diagnostic help

It is very improbable that the overheating protection for the engine oil will take effect, as the engine coolant overheating protection will take effect first and reduce the heat. Perform fault diagnosis as for P0195.