I'm used to tuning the old Jbody engines and not this Caddy.
Looking to get rid of the Catalyst efficiency low code.
I replaced the cat with an aftermarket one and still have the damn code.
Need to pass emissions ASAP. I'll fix it right later, I cant renew plates until its fixed.
I did the mil off ignition on option or something like that. but fail due to readiness check.
It had like 7 options
On the older ECM you just select no mil reported and your golden.
What am I missing?