2015 Mercedes GL450 MED17 DTC P0016 OFF

[JandJSpeedShop]

Anyone help with this or recommend a good software to purchase to do these?

THANKS

[Ignasvw]

It might be loosen timing chain. I have good solution to prevent this fault ,also car always starts ok, from first starter spins

[JandJSpeedShop]

It might be loosen timing chain. I have good solution to prevent this fault ,also car always starts ok, from first starter spins

I have the check engine light off now, but the vehicle has extended cranking before it starts. Anything you can do to help that