Gm Dtc P0420

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Gm/detroit 6.5l engine controlsP0420 code: catalyst system efficiency below threshold (bank 1) 13c-dtc p0442: evaporative emission control system leak detected (smallМетоды ремонта автомобилей форд по кодам dtc p0420, p0430.

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Troubleshooting code p0121 and p0011

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Part 1 -how to test trouble code p0420 (gm 3.8l)

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