My money is on the cat. How many miles is your car?
If you have both P0410 and P0420, then I would replace the sensor first to see if it will get rid of the cat code as well. But I would love to hear what other more knowlegeable people have to say. I'm here to learn as well.
- 2013 GS 350 F-Sport Nebula Gray w/ Cabernet, ML, Nav, PS DVD/Nav Module
- 2007 GS 450h, Starfire Pearl w/ Ivory interior, ML, Nav, Radar cruise, APSSS, dvd/nav wire mod
- 2007 Honda Ridgeline RTS, Silver