ML350 is throwing these codes. I'm curious if it's a balance-shaft issue with my engine. It's got a loud ticking noise that lasts between 800-1200 RPM then goes away, also burns a bit of oil on cold start... You can't hear the noise inside the car, but definitely outside. Sounds like a typewriter. Oil is where it should be. I inspected the camshaft magnetic sensors and they seem OK. Only issue is at 305 degrees, the markings do not appear to be centered. If it is the balance shaft or timing issue, I'm just trying to find a temporary fix to pass it through emissions before I have to R&R engine, or replace balance shaft.