Vehicles using AGP engine list:

Engine AGP

Symptoms:
- Rough idling and poor engine performance
- Difficulty starting the engine, especially when cold
- Excessive smoke from the exhaust, often black or grey
- Reduced fuel efficiency
- Engine warning light illumination

Diagnosis:
- Check for clogged or dirty fuel injectors causing poor fuel atomization
- Inspect the EGR (Exhaust Gas Recirculation) valve for carbon buildup or malfunction
- Test the glow plugs for proper operation, as failure affects cold starts
- Examine the intake manifold and turbocharger (if applicable) for leaks or blockages
- Verify the condition of the air filter and MAF (Mass Air Flow) sensor for accurate air measurement

Fixes:
- Clean or replace fuel injectors to restore proper fuel delivery
- Clean or replace the EGR valve to prevent exhaust gas recirculation issues
- Replace faulty glow plugs to improve cold start reliability
- Repair or replace damaged intake components and ensure turbocharger functionality
- Replace air filter and clean or replace MAF sensor to ensure correct air intake readings
- Regular oil changes with manufacturer-recommended oil to prevent engine wear

Prevention:
- Adhere to scheduled maintenance intervals, including fuel system cleaning
- Use high-quality diesel fuel to minimize injector and combustion chamber deposits
- Regularly inspect and replace air filters to maintain optimal airflow
- Monitor and promptly address any engine warning lights or unusual symptoms
- Avoid prolonged idling and aggressive driving to reduce engine stress and carbon buildup

By following these guidelines, owners of Seat Ibiza, Cordoba, León, Skoda Octavia I, and VW Polo equipped with the 1.9 SDI AGP engine can maintain reliable performance and extend engine life.