I have a 1996 mustang gt with 111k on it. I notice my engine code came on a few weeks ago and it was p1131 and p0131. I did some research and saw that this check engine light could be a lot of things. The biggest things people told me to check was for vaccum leaks clean your maf and the rear o2. I have no vaccum leak my o2 sensors are turned off with the tune I have and I cleaned my injectors and maf. My car runs the same when the engine light comes on and the same after I clear the code but the light always comes back on after 30 miles or so. What could be causes this light to be coming on? Thank you for your help
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