Machine Operation & Maintenance

[Vixen]

I have a c13 cat with an active event 3711-31 that I am not sure what to look for I have changed the dpf temp sensors and the flame and turbo sensors  there are no other codes stored in acive or logged codes but the check engine light is on and i can not do a manual regen doue to an active diag any info would be greatly appreciated on how the system works its kinda vague in service manual

Thanks Joe

[Paul]

3711 - 31 DPF Active Regeneration Inhibited Due to Low Exhaust Gas Temperature