P01A9

Symptoms

• Interruptions in engine operation
• Power reduction
• Increased fuel consumption
• Detonation knocks
• Check Engine Light Illuminates

Causes

• Fuel pressure regulator malfunction
• Clogged gearbox or fuel injectors (for LPG/CNG)
• Damage to the fuel rail pressure sensor
• Gas supply solenoid valve malfunction
• Mechanical damage to fuel lines
• Gas control unit calibration errors
• Mechanical wear of the high pressure pump (for CNG)

How to Fix

1. Read fuel pressure parameters through a diagnostic scanner
2. Conduct a visual inspection of the fuel system for leaks
3. Check the functionality of the pressure regulator
4. Test the rail pressure sensor
5. Clean or replace fuel filters
6. Check the settings of the LPG control unit
7. If necessary, replace faulty components

Related codes

Error P01A9 by Vehicle Brand