Focaljet - Ford Focus Forums - View Single Post - Concerns with my header and lack of an O2 sensor

**n2o Focus** · 07-01-2008, 10:29 AM

Just remember you going to have the check engine light on without a tune, due to the loss of the heat sensors. So if you have something else go wrong that throws a code, you will not notice since the check engine light will already be on. That is one of the main reasons you get tune for the header. Also you shouldnt be running rich, it might smell like that, but you removed the cat so it wont burn off the excess gas not burnt in the combustion chamber.

07-01-2008, 10:29 AM	#10
n2o Focus TEAM Member Join Date: Jun 2007 Location: Wildomar, CA Posts: 204	Re: Concerns with my header and lack of an O2 sensor Just remember you going to have the check engine light on without a tune, due to the loss of the heat sensors. So if you have something else go wrong that throws a code, you will not notice since the check engine light will already be on. That is one of the main reasons you get tune for the header. Also you shouldnt be running rich, it might smell like that, but you removed the cat so it wont burn off the excess gas not burnt in the combustion chamber. __________________ Who Rides The Short Bus?