OBD Diagnostics for Fuel Quality and Combustion Consistency

Low-quality or contaminated fuel can cause knocking, hesitation, and long-term damage. OBD fuel quality diagnostics analyze combustion behavior to identify problems caused by bad fuel.

How Fuel Quality Affects Engines

Low Octane Fuel

Increases detonation and knock risk.

Contaminated Fuel

Water or debris disrupts injector spray patterns.

OBD Indicators of Poor Fuel

Knock Sensor Feedback

Frequent knock corrections suggest low fuel quality.

Fuel Trim Irregularities

Unstable trims indicate inconsistent combustion.

Benefits of Fuel Quality Diagnostics

• Prevents engine knock

• Improves drivability

• Protects fuel system components

Conclusion

OBD diagnostics help drivers detect fuel-related issues before they escalate.