Stefan_G

   Hi,

Did you fix the issue ? I have a similar problem on my high mileage 2009 Audi A4 B8 allroad 3.0 TDI CCWA engine. The car had 2 oil pressure switch sensors replaced by my local garage without any luck (error code not clearing). As Gareth mentioned earlier on the post are these sensors programming-in parts ?

The oil pressure was tested with a gauge & computer tool and was confirmed OK.

Could this be a mechanical fault like engine wear due to running with low oil pressure, oil pump or / and the oil pressure control valve N428 ? The car at the moment is at an auto electrician for troubleshooting / checking wires etc.

Many thanks !

Stefan

error code:

5581 - Oil Pressure Switch 
          P164A 00 [036] - Implausible Signal
          Intermittent - Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 5
                    Mileage: 307591 km
                    Date: 2023.01.31
                    Time: 16:34:23

                    Engine speed: 0.00 /min
                    Normed load value: 0.0 %
                    Vehicle speed: 0 km/h
                    Coolant temperature: 77 °C
                    Intake air temperature: 20 °C
                    Ambient air pressure: 1000 mbar
                    Voltage terminal 30: 11.920 V
                    Unlearning counter according OBD: 40
                    Crankshaft speed (RPM): 0.0 /min
                    Vehicle speed: 0.00 km/h
                    Vehicle voltage terminal 30: 11660 mV
                    Accelerator position: 0.00 %
                    C Eng Ds T u Raw: 2448.2 mV
                    Co Eng st: COENG_READY
                    Engine oil temperature: 11.0 °C