Solenoids can be swapped side to side to rule them out, but usually you can see that it's broken. The screen will be torn up.
To check the timing you would have to pull the front cover as well. While the covers are off check out the cam phaser for visual defects. I had a phaser go out of me and caused an over retard CEL. I could spin the timing mark portion of it with my hand, entirely too soft.
07 gt, CMS cams, hurst, CAI/tuned, LT's, o/r h, m80's, FRPP mani, UDP, lowered with steeda 1.25/1.5, exedy mach 400/race flywheel, 1-pc DS, BMR upper/lowers, 4.10's, CHE brace with TL's, and a few other things that dont add up to much.