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P0422

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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 (https://www.yourmechanic.com/services/check-engine-light-is-on-inspection) you mentioned (P0420 (https://www.yourmechanic.com/article/p0420-obd-ii-trouble-code-catalyst-system-efficiency-below-threshold-bank-1-by-jamahl-walker), P0133 (https://www.yourmechanic.com/article/p0133-obd-ii-trouble-code-o2-sensor-circuit-slow-response-bank-1-sensor-1-by-blake-griffin), and P0171 (https://www.yourmechanic.com/article/p0171-obd-ii-trouble-code-system-too-lean-bank-1-by-andrew-quinn)) 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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