So, after doing a google search, found out that the P0420 code is one of the most searched for on the interwebby thing.
I have a 2007 Suzuki SX4, base model hatchback, AWD, and mostly love it. I normally fill up at Costco when I’m in town, but the other day, had to fillup somewhere else. A couple days later, the car threw the P0420 code.
My mechanic… who comes highly recommended from the Car Talk folks, suggested doing further diagnostics to find out what’s really wrong (as I understand from my research that the P0420 code can mean a variety of things).
So, I was supposed to take the car in on Thursday, but had to cancel at the last minute. On Friday night I filled up at Costco (as normal), and on Saturday morning, the light went out.
Question… I love my mechanic, but they’re kinda pricey. Should I still do the diagnostics anyway to find out what’s wrong? Or should I assume that everything’s “back to normal”?
When I asked someone if a bad tank of gas could cause this, they said, “not likely.”
Oh, and I do keep meticulous records on the MPG. It doesn’t seem like there’s been any significant drop. OTOH, I do think I should be seeing a bit better on the highway, for what it’s worth. Towards that end, I’ve ordered one of the K&N lifetime air filters. Not that that will help the P0420 code, but I like what I read about them.
So… question… should I take it in and find out what’s up? Or… blow it off till the light comes on again?