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no they just check to see if you have cats and then plug into your obd2 to check your codes..but they can tell if you just went in there and cleared them

if i get an off road x pipe does it come with the places to put the pre cat O2 sensors in

ill look into that..i plan on redoing the whole exhaust.. so i dont want to spend alot on the stuff that doesnt matter..thanks

really depends on who checks your car if the do a visual inspection...my solution to that was to just get a couple heat shrouds from some cats and tack them up there so it looked like i had them..if they do check its just quickly with a mirror..i checked and my two front sensors are hooked up...

currently none of my O2 sensors are connected..im pretty sure. i know the rear one are just zip tied up (previous owner chopped up the exhaust). i have to pass emissions to register my mustang..if i get a pair of the just the rear O2 sensors and buy some eliminators to trick the ecm will that...