Also interested in this - anyone have any recommendations for someone in Essex/London area who could fit a manual/mechanical gauge to a T5 2.0l Diesel?Same for me, did you resolve this ?
Steps 1 & 2 I can't test as the buzzer always comes on regardless at the moment. On step 3 the buzzer and light doesn't sound.A. To test the high pressure sensor circuit and wiring (sensor for this is on the oil filter housing):
1. Disconnect the wire to the high pressure sensor on the filter housing and let it float (un-connected).
2. The oil buzzer should now come on and indicator will flash when the van engine speed is above 2000 RPM.
3. Now connect the yellow wire to ground and rev the engine past 2000 RPM… the buzzer should not sound at all.
4. If you fail either of these tests you have sensor issues, wiring, alternator wiring, or instrument cluster issues.
To test the sensor itself:
A test light between the sensor and the positive battery terminal should be 'off' at warm idle and come 'on' as you rev to 1800-2k RPM, if the sensor on the flange is working properly. If the buzzer still sounds with the wire to the sensor grounded the problem is most likely the wiring to the instrument cluster.