how to fix P0171 code in Volkswagen Golf MK6 (2009-2014) for lean condition?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety while working on the vehicle.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, pliers.
• Sub-steps:
  1. Use a vacuum gauge to check for proper vacuum levels; compare to specifications.
  2. Visually inspect all vacuum hoses for cracks or disconnections.
  3. Replace any damaged hoses with OEM parts and secure them with hose clamps.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver.
• Sub-steps:
  1. Locate the MAF sensor in the air intake path.
  2. Disconnect the electrical connector and remove the sensor from its housing.
  3. Use MAF sensor cleaner to gently clean the sensor elements; do not touch them directly.
  4. Allow it to dry completely before reinstalling.

4. Check and Replace Fuel Filter (if necessary)

• Tools Required: Fuel line disconnect tool, socket set, catch pan.
• Sub-steps:
  1. Relieve fuel system pressure by removing the fuel pump fuse and running the engine until it stalls.
  2. Use a fuel line disconnect tool to disconnect the fuel lines from the filter.
  3. Remove the old fuel filter and install the new one, ensuring the flow direction is correct.
  4. Reconnect fuel lines and fuse, then turn the ignition on to prime the fuel system.

5. Test Fuel Injectors

• Tools Required: Multimeter, injector cleaning kit (if needed).
• Sub-steps:
  1. Use a multimeter to check the resistance of each injector; compare to specifications.
  2. If an injector is faulty, remove it using a socket set and replace it with a new one.
  3. Optionally, perform a cleaning procedure using an injector cleaning kit if injectors are clogged.