If we approach the situation as a symptom-cause situation, the symptom is the OP light. The cause is unknown. There is a 3 pin voltage regulator in the instrument pod that may be on it's way out. However for a quick check have the dealer troublshoot the sensor system, not the OP 'problem'. As a very simple check make sure the wiring and contacts from the OP sensor to the instrument pod are intact and secondarily, measure the sender itself. Left as an excercise for the HQOPDT (highly qualified over paid dealer technician) to figure out how to do that. The motor should have 20-50 oil and an acceptable Mahle filter. As a last resort temporarily exclude the VW measurement system by attaching a known good oil pressure guage and reading the values at 1200RPM and 3000RPM. Actually I would do this first but then I have a VDO pressure guage and perhaps the service establishment doesn't. Sometimes just removing and reconnecting the wiring will make the symptom vanish. A recent event at a well known shop caused considerable concern when after some servicing, the check engine light came on periodically, the code thrown by the ECU (SVX motor) was non sticky and showed 'ignition system fault' indicating that the measured voltage at the ignition switch was out of spec. Removing and replacing the connectors to the switch module fixed it. The fault was indistinguishable by the ECU from an ignition fault as rightly it should be. However the ECU considers only it's measured values, an open wire can give a false reading. |
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