V40 L4-1.9L Turbo VIN 29 B4204T3 (2002)
Raise the car.
Remove the engine cover.
Check:
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The oil pressure sensor cable and connectors
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Check for an open-circuit in the cable between the oil pressure sensor and the indicator lamp.
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Type and remedy; try a new pressure sensor.
Note! Use a new seal between the oil pressure sensor and the cylinder block.
Checking oil pressure