I have had my 2004 Infiniti G35 in the shop for well over a month trying to fix my Service Engine Soon light. When I did the initial smog test I passed the emissions portion with no problem but automatically failed due to the trouble codes P0011 and P0012. I have spent close to $3,000 in shop charges attempting to fix this light, but it keeps coming back on despite the mechanic telling me that the car is running perfectly. We replaced timing solenoids, crankshaft and camshaft sensors, the entire ECU and just about everything that is related to these codes. At this point I need to pass the smog test as I have already paid the registration, but my old tags expire at the end of May. This is extremely frustrating especially because I pass the actual part that has to do with emissions. Is there any way to gain an exemption for the check engine light seeing that the emissions of my car are fine and that I have already tried repairing it with $3000 worth of repairs?

Also has anyone had a similar issue and know how to fix this check engine light? Any help is greatly appreciated.

Thank you

 

When you post the word "Shop" are you referring to Infiniti or Nissan or an independent shop? When our cars throw an error code it's because one of the sensors has failed, replacing them eliminates the code....problem solved. Yea, just because you car is running if the error code is showing not gonna get it. When I have issues like error codes I always depend on the guys at my Nissan dealership. After spending all that $$ sounds like your mechanic doesn't know how to work on our cars....sorry!
Gary

 

What did they charge you 3,000 dollars for?

OBD II codes P0011 and P0012 appear to be related to camshaft timing (both over-advanced and over-retarded).

Gary is correct in that a faulty sensor is typically the underlying cause of most SES codes.

I was having problems with gas mileage a few months back and suspected a bad sensor, so I had the dealer run a detailed report which contained expected/measured tolerances of each and everything checked out fine. My issue ended up being related to a vacuum leak, which was addressed by re-torquing the intake. The whole process was only $100, which I thought was well worth it as some of the sensors are pretty expensive to replace.

 

I had these codes about two weeks ago and this is what the dealer did.

P0011 code: https://g35driver.com/forums/g35-cou...011-p0021.html

Like everyone else said, most CEL's are a sensor. It looks like you did the timing solenoids, did you do the O2 sensors?