I can only follow it so far then I need a scan tool...and a vacuum pump...

 

lol. well when youve spent over 100$ on gas and almost 300 miles you tend to get pissed off doing the same thin over and over and over and nothing changing other then the money in your wallet

 

Well now its done 2cycles and i got a p0420

 

Checked again when i got home. It has p0440 now so p0420 first and p0440 second. Any ideas. Theres no unusal sounds or anything

 

Always diagnose & repair DTC's starting with the first one that appears. P0420 is indicating a problem with the catalytic converter, if you follow this flow chart, it will pinpoint the problem. https://blazerforum.com/forum/diagno...plained-19820/

 

well a few weeks ago i found out my EGR was unplugged so could cleaning it out and stuff maybe fix it by a small chance?

 

If there was a problem with EGR, there would be a DTC in memory.

 

Just makes you wonder

 

welp. she needs a new cat conv, egr, vapor canister, and possably a canister vent valve. so shes parked :/