service engine light on 2003 s10

Asked by Jul 12, 2015 at 08:33 PM about the 2003 Chevrolet S-10 4 Dr LS 4WD Crew Cab SB

Question type: Maintenance & Repair

the code for the service engine light that is on came up as; catalyst efficiency low on bank number one, what is the cure for this, I have been told everything from a fuel injector nozzle to a bad plug wire to replacing catalytic convertor. Help.

2 Answers

79,155

P0420, catalyst below minimum efficiency, means that you need a new catalytic converter. But before replacing it check the emissions decal under the hood to see if you have California emissions. If you do the new converter must be C.A.R.B. (California Air Resources Board) compliant. Otherwise the new converter will set the same trouble code. HTH. -Jim

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A new cat

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