Hey guys, i am new here and new with my 08 infiniti g37s. it has only 15k miles on it. Greddy exhaust with highflow cats i believe. And also it has upgraded cold air intakes. Im not sure the brand , i asked previous owner but he had no idea. I bought the car and then on the way home the cel light came on and it came up p0174 which is system to lean bank 2. Im not sure what to start with or what to do, id go to infiniti but i just bought the car and i dont feel like spending an arm and a leg. Please help

Im not sure if this image helps to tell what intake this could be. But please help me try and find out what the issue is! The car was sitting for year from what he said and im not sure if he had regular gas in it while it was sitting but i put in premium and have about quarter tank left with the premium

 

looks like an ebay/generic intake and there is no MAF sensor in it either????

 

Theres 2 sensors connected one on each side on top near the tb and one on the bottom in the middle, which one is the maf?

 

I think I read somewhere that p0174 might be o2 sensor. I'll post up a link if I find it.

 

https://www.myg37.com/forums/g37-cou...lp-needed.html

 

It was also saying something about the cai/ would it be smart to just go back to a stock cai since im not even sure what brand is on the car?

 

Or maybe switch o2 sensors and see if the code changes?

 

That's from emissions related codes.
Had a code from bank 2 when I did fihfcs.

 

Dont mean to sound dumb but what does fihfcs mean?

 

fast intentions (brand) high flow catalyctic converters

 

Ah im not sure what cats they are though. He didnt tell me much or know much. Would you say it could be the tune then that needs to get fixed, he said it was never on when he had it installed which is prob bs

 

Probably, he could have cleared it before giving you the key. I'd say if you have the stock airboxes still, just swap em and see if they get rid of the code.

 

I only have the intakes that are on it, im going to clean the maf and switch o2 if that doesnt do anything would i first buy a tuner or switch to stock intakes

 

switching to the stock intakes would be cheaper for sure and I'm sure you might be able to buy a pair off the private classified section since most people had switched to aftermarket intakes.

However, the tune could adjust air/fuel ratio and gain some horsepower. Since tunes are fairly expensive (~600$) I would wait until you have all your performance mods installed (if you plan on doing any) and then get it tuned.

Hopefully you can get the CEL fixed by switching o2 and checking the MAF

 

If i clean the maf sensors and switch the o2 and still same code , would you replace nboth maf sensors first before anything? Could it be the tune that the light is on with the highflow cats? So many senarios