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When you have a fluctuating problem like that and no fault codes.
Have them check all the ground points that are related to this circuits for voltage drop.
This is gonna be more and more of a problem with newer cars since they use a 5 Volt reference signal instead of 12 Volt battery power.
Computer guys have been working with low voltage signals for a long time but we car mechanics have to relearn.
posted by 66.134.5...
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