psymon wrote:

That is my understanding,  After a bit of research I'm wondering if my ECU is to early and looking for the AAT sensor,   I'm currently unsure if all Pektron cars used the coolant sensor or if some still used the AAT sensor.

Think i read somewhere about the pre cat sensor, but yep doesn't make sense, so probably wrong.

That'll teach me for having right mixed bag of stuff.

Engine bay air temperature sensor was deleted in mid/second half of 2004 starting from VIN RD 634869 in the same time when low coolant sensor was fitted to expansion tank on MG TF cars.

MG TF from VIN RD 632424 to RD 634868 had low coolant alarm wiring fitted but no sensor fitted to expansion tank and therefor you would have checking of low coolant alarm triggered but no sensor - action was needed by T4 to electronicaly shut down that check.

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