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Old 07-10-2011, 03:15 PM
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2005 4.7 WK Code P 0420

Out at a state park today my check engine light came on, when I checked it I got the code P 0420 which led me to this site http://www.obd-codes.com/p0420. The code is a bit of a vague one and I was curious if anyone else has had it and if so, which of the several causes listed on the website was to blame?
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Old 07-10-2011, 03:40 PM
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Re: 2005 4.7 WK Code P 0420

http://www.wkjeeps.com/tsb/tsb_wk_1803405.pdf
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