oil pressure light on after lambda change

[Robin_Cox]

Lambda on our AUA was changed yesterday to fit a genuine NTK one. Engine started up fine to drive home, but after some idling, once driving away, the red oil can sign came on and stayed all the way home. If I am not mistaken, the wiring for the AUA oil pressure switch seems a bit flimsy, and isn't it part of the same loom section as the lambda connector? Was wondering if the act of lambda replacement (or removing the exhaust heat shield to get to it) has knocked the wiring. Tried manipulating it this morning - again, once starting up - no error lights and it idled quite happily for several minutes without any errors or lights. As soon as I drove away, about 30 seconds up the road the beep and the oil can symbol. Same again this evening at work. There were no oil pressure issues before the lambda swap so I am guessing the engine still has pressure, but the detection circuit is dodgy.

I have a new OPS on order overnight in case it has genuinely failed (although the timing is too coincidental for me) - but if fitting this makes no difference, assume I'm going to need to try to test the wiring to the sensor. I am an utter novice at electrical things - so if there are any suggestions I would be grateful.

 

[robskiA2tdi]

Lambda on our AUA was changed yesterday to fit a genuine NTK one. Engine started up fine to drive home, but after some idling, once driving away, the red oil can sign came on and stayed all the way home. If I am not mistaken, the wiring for the AUA oil pressure switch seems a bit flimsy, and isn't it part of the same loom section as the lambda connector? Was wondering if the act of lambda replacement (or removing the exhaust heat shield to get to it) has knocked the wiring. Tried manipulating it this morning - again, once starting up - no error lights and it idled quite happily for several minutes without any errors or lights. As soon as I drove away, about 30 seconds up the road the beep and the oil can symbol. Same again this evening at work. There were no oil pressure issues before the lambda swap so I am guessing the engine still has pressure, but the detection circuit is dodgy.

I have a new OPS on order overnight in case it has genuinely failed (although the timing is too coincidental for me) - but if fitting this makes no difference, assume I'm going to need to try to test the wiring to the sensor. I am an utter novice at electrical things - so if there are any suggestions I would be grateful.

@sergio2305 you after lambda sensor?

Sent from my SM-A127F using Tapatalk

 

[A2Steve]

Yep, sounds like they have possibly damaged the single wire going to the oil pressure sensor.

 

[audifan]

If not the wire, they may have put enough strain on the oil pressure sensor connector to break that.

 

[Robin_Cox]

In which case this legacy thread may prove useful .. and I just realised I had posted on it and was already prophetic. I'm going to hunt a new connector supplied with the wire attached as linked just in case because dismantling / repinning connectors is beyond me (at the moment).

Oil pressure switch connection .

As per title, this thing snapped off the switch earlier, can it be taken apart so a fresh wire can be connected?

a2oc.net

 

[Catnip64]

If you want to test the wiring then this might be useful.

F1 is the pressure switch, it simply connects to the dash panel via the connector. The switch earths this wire when the pressure is below the minimum.

 

[Robin_Cox]

That would do it ... not only is the insulation frayed exposing the copper, but also something I didn't realise at the time should be an integral part of the plug has been broken off since before we had the car (the black tubular bit adjacent to the frayed insulation was flopping around when I replaced the leaking original oil pressure switch 4 years ago but I've learnt a lot more about the connectors since back then!). Replacing the OPS today and re-seating the plug has resulted in the sensor no longer giving an error this afternoon, but I am replacing this connector with a new wired one tomorrow when the heat shrink arrives to seal the join. The new wire is a size bigger than this one and seems less fragile.