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I had my IAT sensor go screwy on me once. No check engine light or error messages in the DIM. All that happened was that the car just lost boost, accelerated very slowly and the radiator fan was running at full blast.

As I had may Auterra with me, it showed that a code was thrown. Basically, the IAT gave a max temp of 105degC and the ecu just cut back on everything to try to cool the car down. Once I had cleared the code, everything was back to normal. The code never re-appeared again... I chalked it down as one of those one-offs...
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