The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

FL72GMC · 01-08-2019, 03:32 PM

Typically yes. You want to remove the VATS (Vehicle anti theft system). Most of the time you want to remove the 2nd o2 sensor also.

01-08-2019, 03:32 PM	#2
FL72GMC Registered User Join Date: Sep 2018 Location: Cocoa Beach, FL Posts: 12	Re: Does the ECM have to be reflashed? Typically yes. You want to remove the VATS (Vehicle anti theft system). Most of the time you want to remove the 2nd o2 sensor also.