Stock Exhaust P0420 Code. Help!

Mikee_Mike

New Member
Apr 25, 2015
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2001 mustang GT stock exhaust with cats. Engine light was on when I bought it. P0420. My brother reset it. 47miles down the road, CEL light came on. My brother and his scanner is out of state so I went to autozone, once again P0420 code. Disconnected the battery numerous times. CEL light kept returning. First time at 47mile then 37, 25.. I bought a pair of mil eliminators from American muscle, because I need the car to pass inspection. Disconnected the battery for 25min while I installed them. Hooked the Battery back up and drove about 30miles and the light came on. Went to autozone for a code read, P0420... Any help would be appreciated.. This car is becoming a major headache. I don't have the money to bring it to a shop or to buy 4 new o2 sensors.
 
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I ended up switching the mil eliminators left to right and the light never came back on. Not sure if one was bad or what.. But swapping them seemed to do the trick. Just passed inspection.