low oil pressure warning / wire - Alfa Romeo Forum
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alfa 147 2.0

low oil pressure warning / wire

hi - have a 147 which is showing low oil pressure warning, but engine and car run smooth and fine and oil is fine. have replaced the oil pressure switch but light still came on. in order to try and diagnose the fault , my husband has now disconnected the wire leading to the oil pressure switch -but the light has come back on? surely this must mean the fault is something to do with the diagnostic system the other side of the wire, not the oil pressure ? is there anything else it could be such as the pump ? would the easiest thing be to put an oil pressure test on it ? any help / advice would be appreciated !! thanks
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hmm I would have thought the light would come on if disconnected the same as if it was connected and showing a fault. I would have the pressure tested as its too higher risk IMO to carry on with a warning like that.
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Not certain on the 147 with its can-bus system, but usually an oil pressure switch earths out on low pressure, causing the light to illuminate...disconnecting the connector should mean it can't earth out, therefore shouldn't illuminate....

Ideally, connect a capillary oil pressure gauge to check the actual pressure......
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low , oil , pressure , warning , wire

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