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What scan tool are you using? Maybe a higher level one would help zero in? Cold can cause issues. One code I started getting in late fall had to do with wastegates and boost reaching a limit. I have a tune and a JB4 controlling meth and adding boost on top of the tune. I gradually reduced the JB4 boost additive from 5 psi to 2.5 psi until the code stopped appearing. I will look into this at some point - there is probably a fix.
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