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P0420 code
Just bought a 2005 Expedition and the CEL came on a day later. Had the codes ran and got the P0420. How big of a deal is this? My county does not do emission checks. Is this something that could be harmful to me engine? Sent from my SM-G930V using Tapatalk- camshaft83
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- Forum: 2nd Gen Ford Expedition Engine & Performance
