Thread: Running no Cat.

Im running with out a cat and am getting horrible gas mileage could this be why? Im going to have the code deleted. would it be a good idea to get an o2 sim? sorry to thread jack lol

Originally Posted by Ricky21

Im running with out a cat and am getting horrible gas mileage could this be why? Im going to have the code deleted. would it be a good idea to get an o2 sim? sorry to thread jack lol

no. the rear sensor, then one that would detect theres no cat, has no effect on air/fuel ratios