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Having trawled through the service manual the WIF sensor return signal pin is adjacent to the engine oil pressure signal return pin in the ECM connector. I guess oil pressure dropping to a certain point as the oil heats up could be triggering the WIF if there is contamination between the pins...

Yes. I first tried a new sensor, behaviour was the same. So then unplugged it completely, and again behaviour exactly the same.

The behaviour is strange but completely predictable so it's not something as simple as a frayed wire sometimes shorting out, more like crosstalk from another sensor. But how that could work in practice I have no idea. I've been doing test runs and from a cold start to first trigger of the light...

Can anyone tell me how the WIF sensor is wired on a 2009 CRD? Mine shows the WIF warning every time I drive it for more than 20 minutes, and draining the filter, replacing the sensor and even unplugging the sensor has made no difference to the behaviour at all. The light doesn't come on until...

Hi, I'm Spudd, and I recently acquired a very low mile Cherokee KK CRD The Cherokee has 24k miles on it and had clearly never been off road so it's really clean overall with just a couple of niggles that need fixing, namely WIF light, dead lock on one door (what a PITA). For some reason...