Hi, I'm new here and I hope you'll forgive me if this has been covered before. I searched but I didn't find all of what I was hoping to. My 05 Sienna of which I am the new owner of is currently giving the P0012 A Camshaft Position Timing Over-Retarded Bank 1 code. Prior to this it was giving the P0022 code which is the same as above only Bank 2. I pulled both OCVs and tested. Resistance was about 7.8 ohms for both. I connected the pins of both to battery voltage and verified that both spools actuated properly. Both appeared relatively clean. I tested the voltage at each lock on connector to the OCVs with the ignition switch ON and saw about 1VDC at each. I pulled the PCV and cleaned thoroughly as it was gummed up and not moving freely. I reinstalled everything and now instead of the P0022 I'm receiving the P0012. I have been scouring the internet trying to find diagrams and information for the VVT system for this particular model and I haven't found much. My next thought was to pull the OCV filter screens and inspect/clean. I'm not sure where they are located. Can anyone tell me where they are on this engine and/or any helpful hints on accessing? I just recently purchased this Sienna and have no records on previous if any maintenance. I suspect regular oil changes were neglected due to buildup just inside the oil filler cap. The oil on the dipstick looks pretty clean but I don't know how long it's been in the crankcase nor whether it's even the recommended type for this vehicle. I put 5 ounces of Seafoam in with the oil yesterday and have been driving. I plan on changing the oil and filter this weekend. Is there anything else I should be checking to try to resolve these codes? Overall the engine seems to be running fine. It sounds good, no knocking or pinging. The engine only has about 116K. I'm not certain at what RPM it should idle at when warm. The guy I bought this from said he felt like it idled low. Usually I see the warm idle RPM at the 700-900 range. Anyway anything that anyone can offer to help me understand this timing system and resolve this issue is much appreciated.