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Hello all, My '99 is throwing the P0222 code. It can be cleared, but recurs intermittently. The engine does not derate, seems to run normally. Possible causes? Solutions?

Truck is mostly stock, but does have a Van Aaken timing box, and a Timbo APPS.

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Bringing this back up......

Did the diagnostic, everything checked out okay. Still getting the intermittent P0222. The code only seems to come up when I have the truck under load (4th gear, heavy throttle, pulling maybe 10k load). Could the Timbo APPS be causing this? It is an older unit, installed 8 or possibly 10 years ago.......

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