Puzzling
Puzzling 
well I am currently having some issues with the old Z. I have a "service vehicle" light that comes on when I drive the car. I am currently getting two fault codes one of which is p0140 and I cant think of the other but it says misfire. The misfire is the one that is causing the light I am pretty sure since it goes away when I clear the DTC's. Also in the misfire it list it as premature I have no idea what it means though.I have not noticed any power loss from the car or rough idle. Only issues right now is with my underdrive and serpentine belt. The only thing really recent that I did to the car is I deleted the PCV system.
The weather has been really wet due to constant rain here in Hawaii, I have noticed the problem since all of the rain has rolled in, dont really know if that makes a difference.
The car is a h/c car with full bolt ons already been tuned. Pretty much everything is new except my coils. Thanks in advice guys.
TECH Senior Member
Joined: Dec 2001
Posts: 5,399
Likes: 3
From: Jacksonville, FL
Service vehicle is different from service engine soon, so thinking SES is what you mean. P0140 is 02 circuit insufficient activity bank 1 sensor 2 (post cat drivers side). Are you running 02 sims/were the codes tuned out? Don't know what a "premature" code means, thinking the code(s) would be either current or history. TTT for you.
thanks, I had the rear o2's tuned out but I will go back and check it. I noticed while scanning that the light comes on after the o2 test is complete. So I am guessing this is the problem. Any how thanks for your time 2001NBMZ28
