2004 Roadster, has 120K , always runs perfectly. Started to misfire, I cleaned the injectors, changed plugs, then found a bad #2 coil. Changed that and it ran fine for 10 minutes then missed again. This time the #1 Coil was bad, changed that and it ran great for 5 minutes, then it barely ran and it threw 2 cam and 1 crank sensor code. I can't even start it now.
How can these sensors get smoked so quickly? Manual says check grounds, which I did. Can it be the Alternator is passing AC and smoking everything? Any0ne see this weird stuff?
OH, and right when this happened, it got really hard to crank over. I tried a charge pack and that didnt' help, which makes it seem like there is a bad ground somewhere. I changed terminals, cleaned the grounds on the body. still nothing

 

The codes should tell you all you need to know

 

It's pretty common for 350Zs to require full cam and crank sensor replacement as they age and/or the mileage piles up. Consider it part of a major 120k service. Replace all cam and crank sensor with new OEM units. Since you also replaced two coil packs, I would replace the remaining 4. I can't stress enough how important it is to use OEM sensors on these cars. You can probably get by safely with aftermarket coils, but considering how long the OEM parts last, I wouldn't risk it. Folks usually end up chasing their tails when using aftermarket parts. The problem appears to be fixed for a short time, then things get even worse after days or even weeks. This leads to more parts canon shananigans. Just be happy it's not a BMW N52/N54, those things chew through coil packs.

But, for good measure, I would still check over all the ground straps to the engine block. The starter is grounded through the block and I believe the ignition system may also be grounded through the block.
Good Luck!
-Icer

 

Wow, that's' really good info Thanks.. its really weird how they happen at onece... I changed a coil then the other failed within 10 minutes.. changed the other coil, and the cams and crank sensor failed within 5 mintues... I'm trying to figure out what is smoking them?