I did the plugs and coils recently on my wife's expy ( same as f150). Since than I got a code p0303. I guess it was a bad coil from new. No biggie, changed coil and cleared code and did not return. Now I got a p0420 which I've pretty much narrowed down to plugged cat. I has no power and 110 kph or 65 mph. Ford oem cat are huge money, even after market one are real bad at about $1000 per side. Has anyone used universal ones with success? I was looking at walker brand.

I'm at a loss what to do? Any help is appreciated.

 

I used the magnaflow ones and I am happy. They were cheap. Just make sure when they put it on they do it correctly and take off that part of the exhaust.

 

If you are still under the emissions warranty, take it in to a dealer.

US warranty is 8 years or 80000 miles.

 

No warranty, I'm at 120 000.

 

Which part are talking about?
Do you have any code issues afterwards?

 

no codes afterwards I went with Magnaflow #94106

 

Well today I had the passenger side cat changed. I had a shop do it. Couldn't wait for the online order as the truck through a p128a code with p420. I was worried about overheating the head or manifold. So I wasn't driving it anymore. Cat was completely plugged. They used a walker cat.