Shutting rear o2's off is easy. Find all related codes with a "Sensor 2" on it and set all to 3, no error reported. Save the file and flash the truck. Also you will want to keep the rear o2 sensors...
Type: Posts; User: 5FDP
Shutting rear o2's off is easy. Find all related codes with a "Sensor 2" on it and set all to 3, no error reported. Save the file and flash the truck. Also you will want to keep the rear o2 sensors...
P0187 is not a code for a GM vehicle with that PCM. It's a fuel code something or other for something else.
Are you sure you have the code number correct??