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700r4transmissionhq.com
Hummer H3 P0401: Meaning, Causes, How to Fix | Drivetrain Resource
P0401 is a very common OBDII trouble code that'll pop up in the Hummer H3. It has to do with the emissions system and stands for Exhaust Gas Recirculation (EGR)→ Insufficient Flow. The EGR system in your vehicle is responsible for recirculating exhaust gasses in order to lower the vehicle's emissions output. There are three
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