Preliminary Work

Information 

If vehicles have fault entries relating to oil pressure, oil pump activation, oil pressure monitoring, etc. in the DME control unit (and a warning light comes "on" on the instrument cluster), proceed as follows:

• Check the oil level. 
• Delete related faults. 
• Do not replace components, such as the oil pump, oil pressure sensor or oil pressure control valve if you suspect that they are faulty. 

If the vehicle has not been driven for a long time (months), the control mechanism in the oil pump can become stiff ("stick").

Very short trips and a lot of loading/manoeuvring can cause the oil to become very diluted => Oil pressure very low. For example, 20 cold starts in quick succession can reduce the viscosity of the engine oil by 30%.

• Change the engine oil. Test-drive the vehicle. 
• If error messages/warnings are displayed again, proceed in accordance with the instructions under Guided Fault Finding in the PIWIS Tester. 

1. Remove oil pan and oil guide housing. → Removing Oil Guide Housing