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This technical bulletin is part of Diesel Help’s member-only diagnostic library.
When fault codes stop making sense, the issue is often understanding how the system you’re working on is designed to operate.
Start here:
Know the diesel fuel system you are diagnosing
Tagged engine derated, engine light on, P1471 - Isuzu Code Regeneration Insufficient, P2002 DPD Efficiency below threshold, P242F - Diesel particulate filter restriction caused by ash accumulation, P2453 - Diesel particulate filter differential pressure sensor circuit range/performance, P2456 differential pressure sensor learnt position
