Originally Posted by
jcdammeyer
I've been using an older code reader to get faults from the vehicle. I've read that the HP Tuners are a class above many of the others. As of the last visit to the dealership my GLK2350 diesel has had a few problems. The code reader I have tells me it's reporting a P229F fault which in the past has switched on the Check Engine Light (CEL).
The fault is still there, I have white acrid DEF smoke coming out the pipes but no CEL. I have the feeling the dealer has switched off the CEL to avoid having to fix things under warranty.
So the question is: Can the CEL be switched ON/OFF with a scanner. If so, can the HP Tuner do this?\
Thanks
John