What is Komatsu Code CA731 & How to Solve It?

What is Komatsu Code CA731:

This Komatsu code typically points to a problem with engine or aftertreatment performance limits being reached — most often tied to excessive soot accumulation or failed regeneration.

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Why This Happens

• DPF is overfilled with soot.
• Forced regeneration was skipped or failed.
• DEF dosing has been interrupted.
• Exhaust temperature readings are inaccurate.

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How to Fix It

1. Check soot level in the DPF using diagnostics.
2. Run a forced regeneration cycle.
3. Inspect DEF system for dosing or temperature sensor faults.
4. Replace any failed sensors and clear all fault codes.

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How to Avoid It Before It Happens

1. Ensure regular regen cycles complete without interruption.
2. Perform forced regen at scheduled intervals.
3. Maintain the DEF system and exhaust sensors properly.
4. Use Clue’s Preventive Maintenance to ensure regular regeneration cycles are completed and maintain the DEF system and exhaust sensors to prevent soot buildup.