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Hello : I have a 2011 f150 eco boost xlt. Engine was replaced at 90,000. Currently have122,000 on truck. My problem started a few months ago when the check engine light came on. The dealer said the Catalytic converters were bad. After hearing what the dealer charges for the job , I went in search of after market cats. Found them on car parts.com. They were installed by my mech. within 50 miles the check engine light made another appearance. Mech. Said the O2 sensor was bad. Just had that replaced and low and behold the light came back on After another 50 miles. Went to ta ford mech friend today and he said there were 3-4 leaks at the catalytic converter area. He suggested a local exhaust shop. They said there doesn’t appear to be any new leaks. Could anything in the engine be causing these problems. ?
The codes were 0420/0430 or 40 don’t recall.
 
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