Had the mystery "no start" happen to me last week. The service engine light came on and didnt go out. Pulled the code and sure nuff, P0335. Crankcase Position Sensor. I purchased a CPS from Autohaus last year due to the recommendation from this forum. Spent 4 hours this past Sunday trying to fish and turn that hidden @@#%! screw underneath the CPS. It had seized and it wouldnt budge. I didnt want to incur any further damage to the screw head so a gave it a dose of Liquid Wrench penetrating oil and left it alone. The next day the screw turned with barely little effort. Took 10 minutes and Im back in business!. Woooo whoooo!

Advice for anyone who will be doing this in the future. Lift the hood to 90 degrees. Remove the heat shield (it will give you more room..but this is optional) Spray the screw head with liquid wrench first and go have a beer while it does its magic. Use a 1/4" E8 torx socket (magnetic preferred so you wont lose the screw) and a 1/4" drive ratchet wrench with a 6" extension.

The forum is priceless. Thanks Guys!!!