Took my car in for my annual inspection. They replaced the serpentine belt, which after 7 years, is probably not a bad thing, but when they tried to get a clean emissions signal, the tech said two modules weren't responding. He asked if I had replaced my battery, and I said no. He said to drive around for a few days and come back to see if it clears.
Understand, it's not throwing codes. Two modules are simply not sending a signal.
Does anyone have any color on this?
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