Tony, the small sensor on the right is the obd1 temp sensor at the thermostat housing. We have two. The one at the back of the head is for the gauge. The one at the front sends messages to the pcm and controls aux fan.
Interesting to finally see what the fault is on Lens XJ. All these small problems go into the database and make life easier for all of us.
My XJ is finally running the best it has ever done in 12 years. I’m not touching it at the moment for fear of upsetting her.
Cheers,
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'95 XJ I6 4.0 AW4 NP242,
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