my Volkswagen Golf Eighth Generation (2020-present) has trouble starting in cold weather

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface.
• Disconnect the battery to prevent electrical shock.

2. Battery Replacement

• Sub-steps:
  1. Remove the battery terminals, starting with the negative terminal.
  2. Unscrew and remove the battery hold-down bracket.
  3. Carefully lift the battery out of the tray.
  4. Install the new battery by placing it in the tray and securing it with the hold-down bracket.
  5. Reconnect the battery terminals, starting with the positive terminal.

3. Fuel System Inspection

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "On" position (do not start) and check the fuel pressure reading.
  3. If pressure is below specifications, check the fuel pump relay and fuse.
  4. Replace the fuel pump if necessary, following manufacturer specifications for installation.

4. Check and Replace Engine Oil

• Sub-steps:
  1. Remove the oil filler cap and dipstick.
  2. Check the oil type and ensure it meets winter viscosity (e.g., 0W-20 or 5W-30).
  3. If oil is too thick, drain the existing oil and replace it with the appropriate viscosity oil.
  4. Reinstall the dipstick and oil filler cap after replacement.

5. Inspect Coolant Temperature Sensor

• Sub-steps:
  1. Locate the coolant temperature sensor on the engine block.
  2. Disconnect the electrical connector and remove the sensor from its housing.
  3. Test the sensor's resistance with a multimeter to ensure it is within specifications.
  4. Replace the sensor if it is faulty and reinstall it, reconnecting the electrical connector.