hey there, i recently installed a magnaflow cat on my 05 blazer 4.3, and i started getting dtc p0420 for catalyst efficency, i was wondering if anyone knows of any aftermarket 02 sensors that are available so my truck will stop throwing this code, or knows of any tips or tricks that will fix this problem, with the abs light coming on and off my dash is starting to look like a christmas tree.
any help will be greatly appreciated, thanks

 

Where did you buy your gas and what brand? The LOOK of the station matters, because it relfects their tank maintenance.

Also.. did you get all the codes off it or just the hard codes. Might have pending codes that would help explain

 

Read this how to on non foulers. http://www.esmhome.org/library/o2-se...2nonfouler.pdf Worked on my buddy's Z28 Also, what was the part number for the Magnaflow cat? Future reference you want to make sure the part # on Magnaflow cats ends with HM for heavy metal. Better quality of material for an extra $25-30.

 

Yep Non fouler 20 mins labor no more po420. Been there