My "Service Engine Soon" light came on today when I was driving around 30mph and had about 20miles of gas left. I filled it up thinking maybe that was the problem but I filled my car up and it's still on. What could be wrong? I hope it doesn't get expensive...
Oh yeah my car's a 2008 G37 coupe with about 60k miles. fyi

 

Ok I took my car to autozone and got the code P0420:

-Catalyst system efficiency below threshold - bank 1 probable cause
-Large vacuum leak
-Rich AF ratio - fuel system faulty
-Ignition system malfunction
-Faulty catalytic converter

What is the easiest thing to check for?

 

Youre good take it to the dealer your warranty on cats is 8/80 it will be under warranty.....

 

Your right it was that, they fixed it. I thought I was gonna have to pay for something but didn't pay a dime. Wish every trip to the shop goes like that. lololol

 

yeah youre lucky those cats are around 1200 bucks a piece before labor! i love my dealer they never tell me i need anything thats not necessary never get my car washed there after horror stories but they take very good care of me

 

Damn it! I'm 5000 miles above it and 6.5 years into ownership....ugh....my service engine light came on shortly after i scraped my car pretty badly going into a steep parking lot entrance...I get a funny feeling it'll be my cats.