Hello and HELP! CODE P0420
Hello everyone and this is my first post on the forum. I love my truck although I haven't done a ton to it, just but 35" tires. Just wanted to say hey and I plan on being part of this family for awhile since I still have a lot of plans for the truck.
Anyway, sorry to jump in with a problem, but I have one. After a 800 mile trip to and from Reno, our truck threw a CEL. The code is P0420. I had this checked recently and it came up with the following:
Catalyst efficiency low-bank 1
The oxygen sensors monitor the catalytic converters ability to store oxygen.
1.) Catalytic Converter defective (Failure possibly due to #2, 3, or 4)
2.) Engine misfire or running condition
3.) Large Vacuum leak
4.) Engine oil leakage into exhaust-valve guide seals, piston rings
Now some backstory. Right now with Christmas coming, I don't want to take it down to someone right yet with out trying to figure this out a little by myself. I have had people recommend replacing the O2 sensors, but after checking it looks as if there are 4 of them (2 before and 2 after the CC).
What would you guys recommend? I really would like to get this solved without having to shell out tons of cash right before the Holidays.
Thanks again for everyone's help.