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Hi there
Can anyone please tell me what this sensor is called , what it does and the part number? It’s on my x308 4.0 sc, 2001. Located underneath air duct inserted into the intake main plenum I think. It’s the one to the right of the TPS. Small 2 pin plug with clip.
I have “restricted performance “ and suspect it. I tried cleaning the contacts but no luck. Help most appreciated!!
Is this an AJ27 XJR 4.0?
If it is going into the intercooler/charge air cooler, it looks like the IAT2 sensor - Air Intake Temperature 2 sensor - allows the ECU to retard timing if the air charge gets too hot/heat soaked. Separate from the primary MAF air intake temperature sensor.
My uninformed speculation - I would doubt this is the culprit, more likely some kind of air intake leak, especially if not throwing any codes and appears mostly at idle speeds, and clears itself on extended highway driving.
Symptoms? Any codes?
Much appreciated! It’s sort of related to my other post whereby I was getting 0172 and 0175 both banks too rich. I suspected the coolant temp sensor and replaced it. No luck. It comes back “restricted performance “ after a few journeys. So I then disconnected the battery- took out this air temp sensor, I lost the clip a while ago. It was loose.
so I cleaned the sensor (it was covered in gunk) and put the plug back on , held with wire and 2 cable ties. No clip available anywhere in the world. Weird. But it’s solid on.
I then noticed (after getting the duct off) that the flexi tube for the crank breather had the snap clip broken, which made the pipe loose on the air duct. I guess as that as this is past the MAF, it was sucking in air . This may cause the ecu to pump more fuel?
so I then reassembled everything and she’s fine. (So far!
I put a piece of duct tape over the crank breather tube clip to secure it. I’m not sure of the part number.
I’m fairly confident I have solved it. But I’m not sure which aspect was responsible.chirpy, you may well be correct all along. The broken clip was hard to spot, as the break was underneath.
attached is the before and after pictures of the air temp sensor. Why is a new one so expensive, whilst the coolant one cost me £8.88…
Last edited by Julia700; Aug 23, 2023 at 03:11 PM.
This type of clip is used on connectors on practically every car. You cannot buy it separately but you can buy a new connector having the same clip and transfer it to your connector. Just in case, the clip is pressed in when disconnecting the connector.
What is this sensor?
