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Re: Mystery Pellets
Posted to Technical Discussion Forum on 1/7/2017 1 Reply

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Mileage was around 17,000. There have been occurrences of p0420 on some 2017 Volts. At first, G.M. wanted to replace the rear O2 sensor. Next, they wanted to reflash the PCM and PIM. Both were previo... Login to read more.

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