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danomano · 10-25-2010, 08:48 AM

After trans rebuild I have been getting randomly. I have replaced both upstream O2 sensors and every other week I get the code on onside or the other.

Last thing I have done is clean the MAF sensor and air temp sensor. So far no issues. But if it comes back any ideas?

Oh if this does come back I have heard it can fail you on emission testing I am good for another 9 months.

10-25-2010, 08:48 AM	#1
danomano Registered User Join Date: Dec 2007 Location: Austin,Texas Posts: 146	Codes P0420 and p0430 After trans rebuild I have been getting randomly. I have replaced both upstream O2 sensors and every other week I get the code on onside or the other. Last thing I have done is clean the MAF sensor and air temp sensor. So far no issues. But if it comes back any ideas? Oh if this does come back I have heard it can fail you on emission testing I am good for another 9 months.