Code PO421

[ABJ]

code definition; [ warm up catalyst efficiency bank 1 below threshold ] not sure what I am dealing with here, what can cause this and how can it be resolved. 2016 ram 2500 mega cab less than 100 thousand miles. HELP

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[watersupply189]

code definition; [ warm up catalyst efficiency bank 1 below threshold ] not sure what I am dealing with here, what can cause this and how can it be resolved. 2016 ram 2500 mega cab less than 100 thousand miles. HELP

Sounds like one of the sensors in your exhaust is bad.

Common for trucks with emissions still intact!!


2016 Ram Laramie 3500 (DRD), G56, 6.7, Rough Country Leveling, HID headlights, Morimoto LED fogs plus a whole lot more!

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[ABJ]

thanks for the input

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[Polaraco]

code definition; [ warm up catalyst efficiency bank 1 below threshold ] not sure what I am dealing with here, what can cause this and how can it be resolved. 2016 ram 2500 mega cab less than 100 thousand miles. HELP

Sounds like one of the sensors in your exhaust is bad.

Common for trucks with emissions still intact!!


2016 Ram Laramie 3500 (DRD), G56, 6.7, Rough Country Leveling, HID headlights, Morimoto LED fogs plus a whole lot more!

Yup.

Try taking the sensors out and cleaning them off.

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