fordguy427

Have an 07 GT, put Pypes high flow cats with X-pipe and mufflers. After about 900 miles,it threw a code. I tried to buy MIL eliminator harness, but only found them for older Mustangs. How can I reprogram or whatever, to get rid of that pesky engine light on my dash. I cleared the codes and took a 100 mile ride this weekend, and no light. But I fully understand, it WILL come back on.
Thanks in advance,
Lee

smokestang

It shouldnt be throwing a code with cats, but ive had it happen before. your best bet would be to get a tuner and tune with the o2s turned off.

goose5

Mines throwing a code with cats aswell. You need to get a custom tune with the Catalyst monitor disabled.