p0420 2013 lx570

Joined
Sep 21, 2019
Messages
113
Location
Detroit Michigan
so i recently bought the truck with 136k miles from my friend, dealer maintained since new drove it for a few days and 4lo started to blinking, check engine, and trac off while i was driving. That scared the crap outta me, plugged the techstream and it turned out to be p0420, if any had an issue and solved it pls let me know. bad o2 senor, bad cat, bad fuel. i think he use to pump it regular gas not premium, that might cause it idk.
 
Joined
Oct 20, 2022
Messages
32
Location
NY
Use a bottle or two of cataclean and use premium non ethenanol in the gas tank. Is there a bad sulfery smell also?
 

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