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danomano · 10-25-2010, 05:20 PM

More info.
All spark plugs were replaced two months ago along with cap and rotor. All the old plugs were in good shape.
No other code have been happening. Just one week p0420. I hook up scanner and watch back o2 they appear good so I clear it. Then next week I get p0430. same thing again

I am thinking of running GM Fuel System Treatment PLUS P/N 88861011
or seafoam.

10-25-2010, 05:20 PM	#5
danomano Registered User Join Date: Dec 2007 Location: Austin,Texas Posts: 146	Re: Codes P0420 and p0430 More info. All spark plugs were replaced two months ago along with cap and rotor. All the old plugs were in good shape. No other code have been happening. Just one week p0420. I hook up scanner and watch back o2 they appear good so I clear it. Then next week I get p0430. same thing again I am thinking of running GM Fuel System Treatment PLUS P/N 88861011 or seafoam.