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What does this engine light code mean?

JesseBranham

New member
What does this engine light code mean and how do I repair it?
P0102 Powertrain
Mass or Volume Air Flow Circuit Low Input
 


It means there is something wrong with the mass air flow circuit. You need to check the wiring and if the wiring is ok replace the sensor.
 
I just got a code "P0420" "Catalyst System Efficiency Below Threshold Bank 1" Does anyone know what this actually means? Thanks
 


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