how to fix the P0171 code on my Volkswagen Golf MK7.5 (2020-Present)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical short circuits.
• Allow the engine to cool before starting work.

2. Inspect and Repair Vacuum Leaks

• Check all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Use a smoke machine or carb cleaner to identify leaks, if necessary.
• Replace any damaged hoses or gaskets.

3. Clean or Replace MAF Sensor

• Locate the MAF sensor, typically found in the air intake duct.
• Remove the MAF sensor harness connector.
• Unscrew the MAF sensor and carefully remove it from the intake.
• Clean the MAF sensor using MAF cleaner spray; do not touch the sensor elements.
• If damaged, replace the MAF sensor with a new one.

4. Check Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail test port.
• Start the engine and monitor the fuel pressure; compare readings to manufacturer specifications (usually around 50-60 psi).
• If the pressure is low, check the fuel pump and filter for issues; replace as necessary.

5. Test Fuel Injectors

• Perform a resistance test on the fuel injectors using a multimeter; compare readings to specifications.
• If any injectors are faulty, replace them with new ones.

6. Reassemble and Clear Codes

• Reinstall all components removed during the diagnostic process.
• Reconnect the battery.
• Use the OBD-II scanner to clear the P0171 code and any other stored codes.