So I had the codes pulled for the SES light in my 02 I35. P0550 is a faulty PS pressure sensor and P0021 is the crank- and/or camshaft sensors. I did some research and it seems the crank- and camshaft sensors were recalled in these cars back in 2002. When I bought this car in 2012, all the recalls were up-to-date so it could be the recalled sensors the dealer replaced went bad again. I'm going to call the local Infiniti stealership tomorrow and try to get this taken care of on their dime. If I don't get anywhere with them, how easy is it to replace the sensors on my own?

Regarding the P0550, anyone know where this sensor lives and if it's a DIY job? If this sensor is near the high pressure hose, is it possible the hose is leaking (as is very common on these cars) and that in-turn damaged the sensor?

Funny thing is car runs great right now.

 

The PS sensor is located in line with the high pressure line, just behind the strut tower.