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Apologies for not updating sooner - the day before I took the truck into the dealer, the check engine light cleared itself. I got them to check it anyway. They did a few tests on both the intake and EGR systems and came up with nothing. I haven‘t towed since, but normal driving hasn’t thrown...
This sounds useful, if nothing else than to provide info and peace of mind. Did you run multiple tests, or just one? If multiple, was there an accumulation in temperature?
Many thanks