Common Fault Patterns After Poor Tuning

🧠 Part of the TuningBot ECU Knowledge Base — in-depth documentation on ECU logic, maps, emissions systems and safe calibration methods.

Poorly executed calibrations produce characteristic fault patterns.

Torque Monitoring Faults

Cause: Torque model not updated to match fuel/boost changes.

Symptom: Sudden power loss, limp mode.

Boost Deviation Faults

Cause: Targets raised beyond turbo capability.

DTCs: P0234 (overboost), P0299 (underboost)

Smoke/EGT Issues

Cause: Fuel increased without matching airflow.

Symptom: Visible smoke, high EGT.

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