A subject vehicle may exhibit an illuminated check engine lamp with DTC (Diagnostic Trouble Code) P0421...
Hino technical service bulletin SB-14-012 for 2015 Hino Conventional Models, 2015 Hino NV8J and 2015 Hino NE8J and others.
- Bulletin number
- SB-14-012
- Component
- Engine and engine cooling: engine: engine control module (ecu/ECM): software
- Summary
- A subject vehicle may exhibit an illuminated check engine lamp with DTC (Diagnostic Trouble Code) P0421 (Catalyst efficiency below threshold). The engine ECU may falsely detect an issue with the ATC (After Turbo Catalyst) with the current ECU software. If DTC P0421 is stored in the engine ECU, reprogram the ECU to the latest software level prior to suspecting a fault with the ATC.
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