Bought a actron 9180 scanner for xmas and able to clear and fix my codes on my 03 frontier, in the meantime I've helped a few folks at work with there codes, it's a sorta hobby I guess. This code I'm not familiar with so I went straight to obd.com (the best obd code websight imo) they give a pretty clear description of the code and the most likely reasons a code comes up. Don't go to the forums, but rather go to the code lookups, thankfully your code is highlighted so you can push the link and get some good info, it would be best if you went there and looked at your problem as it looks to be rather involved, your gona need to be fairly good at using a voltage meter. Good luck and remeber the easy stuff first, look at the connection to the sensor, frayed wires/
A little navigation help.
1 google obd,com
2 on the top bar home / store /trouble codes (click trouble codes then scroll down till you get to p0335)
3 Thankfully p0335 is highlighted in blue so click on it and get the basic info you'll need.