PO420 catalyst efficiency - Dakota Durango Forum
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post #1 of 4 Old 05-30-2011, 05:50 AM Thread Starter
01Dak4.7
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PO420 catalyst efficiency

I have an 01 Dakota with the 4.7, my check engine light keeps throwing this code, buddy of mine with an 01 R/T says the driver side converter is going bad cuz his did the same, If anyone has any experience with this please let me know, I'm trying to narrow it down, I've already replaced the upstream o2 sensor bout 3 weeks ago cuz it was throwing a heating circuit malfunction code, If the converter is going, Ima sell my superchips flashpaq, remove the y pipe, gut all 3 and get an sct tune and get the downstream o2's deleted like my friend did, but any info is appreciated
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post #2 of 4 Old 05-30-2011, 03:44 PM
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Yep sounds like a cat...got same problem on my van replaced both o2s and still same code...90 bucks for the cat and should be fixed...I'm in Texas so can't delete cats or anything

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post #3 of 4 Old 05-30-2011, 08:57 PM
modain
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Sometimes an old post cat sensor will throw that code after the pre cat sensor has been changed. Change out the post cat sensor and see if this makes it go away.

2002 Graphite QC SLT Plus, 4.7L, NV3500, Superchips 3715, HO Cams, 2003 Intake Manifold, Dwight's 65mm TB, 3.92 LSD, R/T rear swaybar, no chrome
2001 Patriot Blue Durango SLT, 4.7L, 545RFE, Superchips 3715, Fastman 68mm TB, Jeep GC TCM, R/T rear swaybar, 3.55 Open (for now)
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post #4 of 4 Old 05-31-2011, 10:46 PM Thread Starter
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thanks for the information, Ill try to replace that other sensor to see if it solves the problem, if not I may just replace the converter, I don't really wanta gut my converters due to the fact that I have straight pipe exhaust lol and its already loud enough
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