It comes up as exhaust temp sensor.
Sometimes there are 2 temp sensors in the exhaust system, one at the forward cat, another at the DPF (if you have one).
Unless a wiring fault with the B16/14 it looks like you need 2 new exhaust temp sensors.
V often the rust locks 'em in, more so on the DPF, and the thread becomes knackered on removal.
Lots of Plusgas might help, and run exhaust up to (an unknown) temperature.
While differential pressure initiates a regen, I would expect the knackered temp sensors would inhibit that.
So it's been going into regen every fifteen minutes and it's been driving me nuts so I've resorted to sticking all sorts into the dpf to clean it, which has knackered the sensor showing 1200. The b16 one has never shown anything buy zero.
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