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I had all the following codes come up on my ECU,

P0130 A/F Sensor (B1) or HO 2SI ( B1)

P1525 ASCD Functionor Consist MPX SIG CC/SL

P242F DPF Ash Accumalation

And on the OBD2,

P2425 DPF Restriction - Ash Accumalation

Instead of replacing sensors and the DPF what should the mechanic be looking for? What would cause all thes codes and block the DPF?

Vehicle: 2009 Nissan X - Trail 2ltr Turbo DCi

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