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P0422 Diagnostic Trouble Code Discussion for March 2008

Catalyst Efficiency Below Normal (Bank 1)

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Trouble Ticket Help Requests for DTC P0422
Help Request Posted
2001 Kia Sephia LS 1.8L Hesitation, Cuts out, MIL Lamp on VIN: KNAFB12111
P0422: Catalyst Efficiency Below Normal (Bank 1). Customer stated this started all at once.Car will not accelerate but seems to idle just fine.Slight acceleration is decent but not under any load. plugs were not gummed up.This acts like a fuel problem because it will popback through the intake slightly like a...
March 20, 2008