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Please help me with these codes

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140 173 6 = Insterment cluster exhaust temp current below normal or grounded circuit

128 35 9 = Engine exhaust gas recirculation EGR mass flow rate abnormal

128 412 9 = Engine exhaust gas recirculation temp abnormal undate rate

Looks like you have a issue with mass flow pipe and sensors, but I would check engine ecu module connections for contamination first. These trucks are not easy to fix without a computer hooked up to see what is really going on. Good luck

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