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P0422 OBD-II Trouble Code: Main Catalyst Efficiency Below Threshold
P0422 means the catalytic converter is malfunctioning. Other causes may be oxygen sensors, fuel pressure regulator or a mass air flow sensor.

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failed emission test at Division of motor Vehicle
Hey there. The three different Check Engine codes ( you mentioned (P0420 (, P0133 (, and P0171 ( would need to be diagnosed first to see why they are stored in computer memory. You will need the mechanic clear the...

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