Soooo, it was time to get my better half a new car and after purchasing a great 07 Tahoe (which I am very picky when it comes to buying cars ) sold it and did a impulse buy got an 03 350z ( seller was a straight con artist ) smooth talker. She loves it I hate it , might sell but I would never sell a headache to some one else so I start touching it up trying to get it reliable , so first day smoking from valve cover leak , while I was in there I did the spark plugs and intake gasket , now I get a p0152 when I look at the data stream the sensors numbers aren’t acting same as what I’m used to , I read a lot about having to tune the cars with aftermarket parts , how can I tell if the car has a tuner in it?and do new plugs cause a tune update ?

 

Usually when the engine has been modified with things like intake and exhaust people use spark plugs that are one step colder... If your car was tuned for that... possibly thats the reason its throwing a code.

Looks like you have a aftermarket plenum. So who knows what else is going on.

Good luck.

 

I replaced with the same plugs that were in it , I can’t believe they cost 100$ , I’ll look in previous threads for info about tuning , thanks for the response….any one in Bay Area looking to buy thinkin bout selling