Medium and Heavy Trucks
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Code 3720-15 is defined as "A maximum limit for mileage for servicing the DPF has been exceeded". This code indicates the DPF is full of Ashe and must be removed and cleaned. A regen only removes the collected soot from the exhaust. Not the Ashe build up. In order to get this code removed, an Diesel Particulate Filter Ash Service Reset must be performed with Cat ET software. Cat factory passwords is needed to do this.
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