jrbeavers559

So I'm fairly new to the infinity world. I've been going through threads but not sure where i should start. I have an '08 g37 coupe with a p0300 code on it (yeah it sucks cause it's a general code). I'm not sure where to start I have new cats on there new spark plugs. When I shut the car off it dies really rough. I'm not exactly sure where would be the best place to start.

sydnrusty

iTrader: (2)

I'm living the same hell as you my friend (my posts are in the "engines" subforum).
Dealership and I have been chasing this damn code for 2 months now. Have replaced a bunch of stuff and still no luck. Fortunately I'm still under warranty so no cost to me so far (aside of my time and patience).

Rad_Slinger

iTrader: (12)

p0300 is a random misfire code.

i got the same code when i changed to fast intentions HFC. what i did was clear the code. hasn't come back.

i would suggest clearing it and see if it comes back.

jrbeavers559

I tried getting rid of the code and it comes back a few days later

Rad_Slinger

iTrader: (12)

I would check there's no leaks where you installed the new cats. Also, check the O2 sensors are tight into the bungs.

My drivers o2 sensor was loose when I threw the code. My mechanic said this may have been the cause.

jrbeavers559

I'll give the O2 sensors a shot. That'd be nice if they were just not tight. Appreciate the help guys

G37xBrock

Did this end up solving the issue? My car just started throwing this code. Trying to not sink a bunch of money into it if I don't have to.

soundkillr

Fyi my car was showing a misfire code. Replaced a lot of things. Ended up being the front left and right "o2" sensors. These are essentially afr sensors, and when they dont work right the car can lean out....

Huaniitoo

I had the same issue. Took it to the dealer updated the ecm and hasn't came back on (knock on wood)

mjunod

https://www.myg37.com/forums/engine-...ill-there.html

[mod edit]Copy the url of the thread you want to reference and past it in the other post.