mike_980

Attached is a picture of a plug - they all look the same

Thanks for the replies. My wideband is an AEM UEGO gauge with the Bosch 4.9 LSU sensor. It is mounted in the exhaust at about 10 I clock to prevent moisture from killing the sensor. It was brand new when I fitted it about 6 months and 3000 miles ago and worked faultlessly until yesterday. I am inclined to believe the wideband at the moment until I get some more information I think. The only thing which I have doubts with about the sensor is after I installed it, I later realised that the top of the sensor and the wires coming out of it were pressed against the heat shield which could have caused damage to the wires - but since I sorted that out it has been fine for a couple of thousand miles.

I don't have any way of checking the fuel pressure other than measuring the flow to the fuel rail by measuring how much comes through in a fixed amount of time. It seems fine though. The fuel pump is the 4g93T GSR fuel pump and the ECU is standard. Are there any electrical tests I can do on the switching sensor in the turbo elbow? I was curious as to whether a resistance of 150Ohms between the harness connector (earth pin) and the battery earth was correct?

I have had to do some modifications and repairs to the engine harness so it is possible that I have made a mistake somewhere which has caused a problem to show after some time.