My G35 randomly stopped at a red light. I was able to turn it back on. Sounded like it was having a harder time than usual but it turned on. I I drove it back home and ran a diagnostic and got p0335 and p0420 codes. We had a heavy snow week prior and I remember starting my car after the snow melting and my exhaust sounding different, almost like a deeper sound and i remember for a moment i could feel it in the seat. Drove fine for about a week then randomly shut off at a light, the day before I was able to drive it about 60 mi with no issue. I changed the camshaft position sensors and crankshaft position sensor. Last year they're about 10 to 11 months old not even a year, but since that issue I would get random shakes while in idol. So before I go out and spend money on new cats and a O2 sensors, I was wondering if anyone else has experienced a similar issue?

 

Update on the issue for anyone getting similar codes. I replaced the crankshaft sensor and the codes went away, initially when i replaced my valve cover, plugs and position sensors i used aftermarket. I ordered oem and got some over night aftermarket ones for time being .Just the infamous U1000 code remained which ive had since i replaced the valve body incorrectly the first time.

 

So p0 335 is the cam sensor position a circuit. Either you have a problem in the wiring harness or the sensor that you have is bad. Normally we're replacing the cam sensors is to disconnect the battery on both ends positive and negative after you're done doing that type both ends together drain all the power from the system so that way the ECU has a hard reset. After you replace the sensors. Then start the car after your place hook everything back up make sure everything is kosher. And then do what's called an idle air relearn please have your AC on all the way so that way the engine can idle if you're in a hot place if not then just do the idle relearn without the AC on. P0420 means that the cat is failed on bank 1 which means that the catalytic converter is not doing its job either a there's a little bit of oil Sea bridge coming in from the exhaust line contaminating the catalytic converter from the top end or there's not enough and the fuel is contaminating with cat as well. my bad is that replacing the cat and making sure that all of the connector harness making sure the pins inside the connector harness are good tracing the wires back to make sure the snow breaking the wire you can also do a wire you can also do a voltage test I'm pretty sure the cam sensors set at 5:00 or 7 volts of power. If they are at the same consistency for voltage then there's nothing wrong with the connection harness I think it's just a sensor needs to be replaced I would replace both cam sensors just because you need to ensure that if both the cam sensors are brand new and they're operating efficiently and effectively and the code still shows up again then there's a problem with the PCM not receiving the signal which means there's probably a bad wire connection somewhere from the PCM module all the way down to the ID PM module and then off to the cam sensors. Now u 1,000 speaks at the can bus is not communicating properly with everybody in the network this is due to a weird ground issue I would do this trick it worked for me I've been a performance mechanic for 10 years and I figured it out pretty quick. so these cars are supposed to have another ground wire harness that comes off of the motor onto the frame of the vehicle also soak all of your grounding points in Coca-Cola really good let him sit for like 10 20 minutes and then get a wire brush and completely clean them off and Coca-Cola will put a coating on them so that way the corrosion buildup is like basically nil to none.

 

Also another question is do you get u 1001 along with the other u code. Because if you do then it is that weird ground strap issue and that ground strap issue comes with the command can bus not communicating properly cuz there's not enough grounds on the vehicle it's weird when I say that but it's an actual true facts I dealt with it on my '04 G35 when it showed you code 1,000 you code 1,001. These codes are very tricky and it was kind of a pain in the *** moment because sometimes I put the car in limp mode and it would shut it down because it wouldn't allow it to start because there was an ineffective activity on the can bus. So the strap for that round wire there are two additional holes on top of the timing valve cover you can run a ground wire from the top of that cam valve cover streaming across and run it inside where your battery housing is and there's a grounding spot that is open where that grounding battery is at and ground that new ground wire strap off from the motors cam timing cover case and run it to that zone on the other side where there's a couple more ground wires since drop zones cuz that's okay and it'll balance out the grounding and electric voltage conductivity and help the motor run a little bit better