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01 Dodge Cummins throwing PO121 code
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seedcleaner
Posted 3/5/2014 20:28 (#3735732 - in reply to #3735628)
Subject: RE: 01 Dodge Cummins throwing PO121 code


Mid-Missouri		Google your code and you can stay up for days reading...
http://dodgeforum.com/forum/dodge-cummins-diesel/230797-p0121-cel-n...
is the first hit I found on it.


I will say one thing, check your wiring harness under the hood along the firewall in front of and under the driver side windshield wiper. There is a connection or two there with a "cam" lock design on the plug, and that has came undone for me once.
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