AznGouki

Hey CL,
Been researching a few days and can't quite find the information I'm looking for.
Codes:
P0016
P0017
P0018
P0019
The car runs perfectly normal. No start issues, or rough idle or anything. No out of the ordinary noises or even fuel economy change.

I'm thinking that maybe the sensors are dirty so was wondering where each of them are located so I can inspect them.

I found this engine diagram on a IS350 post and a is250 post. I assume both engines are laid out similar?

If you guys can point me in the right direction that would be greatly appreciated. I assume that each code belongs to each of the 4 camshaft timing OCV?

Thanks