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sprinkles08, Chrysler/Dodge/Jeep master tech
Category: Dodge
Satisfied Customers: 22388
Experience:  ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans and Hybrid Specialist
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Ram 1500: 95 dodge ram 5.9, getting DTC 43, 42 47 21 after

Customer Question

95 dodge ram 5.9, getting DTC 43, 42 47 21 after comp cam and engine rebuild
Submitted: 1 year ago.
Category: Dodge
Customer: replied 1 year ago.
i expected a slightly erratic idle... Runs good at higher RPMs... replaced Oxy sensor with an Auto Zone, suspect it not sending good signal.
Expert:  sprinkles08 replied 1 year ago.
Hello and welcome to JustAnswer!
Code 43 is for the ignition coil primary circuit. This could be a wiring issue but is usually the coil.
42 is for the ASD relay and could be the relay, the control circuit or a loss of power to the relay. It woudln't run if this problem was present.
47 sets when charging voltage is low and is usually the alternator.
21 sets when there is an oxygen sensor issue but the code is vague and could stand for a number of actual oxygen sensor related codes. A scan tool would be needed to know what actual code is setting. This is usually the sensor itself but could be a wiring issue or the signal could be biased because of the way the engien is running.
If you clear the codes do any return?