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P0406

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P0406 OBD-II Trouble Code: Exhaust Gas Recirculation Sensor "A" Circuit High
P0406 code definition P0406 is a general ODB2 trouble code indicating a fault within the exhaust gas recirculation EGR circuit. This code is similar to P0400, P0401, P0402, P0403, P0404,...

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Question
What is the code P0406 and P0128?
The code P0406 is for the electronic gas recirculation valve high circuit input. Meaning the valves sensor is detecting a high voltage input. This can be due to carbon build up on the valve, a bad valve, or a bad...

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