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Definition of check engine code P1420:
BMW:
Secondary Air Valve Control Circuit Electrical
Chrysler/Dodge/Jeep:
Register Resonant Charging 1 (RRC1)
Citroen/Peugeot:
Catalyst Temperature Sensor Failure
Daewoo:
EGR CONTROL
Ford:
Catalyst Temperature Sensor Failure
GM:
Intake Air Low Pressure Switch Circuit Low Voltage
Honda:
Nox Adsorptive Catalyst System Efficiency Below Threshold Catalytic converter
Mercedes:
AIR pump switchover valve (Y32)
Toyota:
Intake Constrictor CTRL Circuit Open or Short
Volkswagen/Audi:
Sec. Air Inj. Valve Circ Electrical Malfunction
Volvo:
Sec. Air Inj. Valve Circ Electrical Malfunction
Subaru:
Fuel Tank Pressure Control Solenoid High Input