how to fix P0171 code in Skoda Octavia NFL (2020-Present)

Learn how to diagnose and fix P0171 engine lean condition in Skoda Octavia NFL. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the vehicle battery to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Multimeter
• Fuel pressure gauge
• Socket set
• Screwdrivers

2. Inspect and Repair Air Intake System

• Sub-step 1: Visually inspect all vacuum hoses for cracks or disconnections. Replace any damaged hoses.
• Sub-step 2: Inspect the intake manifold for leaks using carburetor cleaner. Spray around the manifold gasket and listen for changes in engine RPM.
• Sub-step 3: If leaks are found, replace the intake manifold gasket and reassemble.

3. Clean or Replace MAF Sensor

• Sub-step 1: Disconnect the MAF sensor connector and remove the sensor from the air intake.
• Sub-step 2: Clean the MAF sensor with MAF cleaner spray, avoiding contact with the sensor element. Allow it to dry completely.
• Sub-step 3: Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel System

• Sub-step 1: Connect the fuel pressure gauge to the fuel rail and turn the ignition key to the "On" position without starting the engine. Record the pressure reading.
• Sub-step 2: Compare the reading with the manufacturer’s specifications. If the pressure is low, inspect and replace the fuel filter or fuel pump as necessary.
• Sub-step 3: If pressure is adequate, check the fuel injectors for proper operation, either by using an injector tester or visually inspecting for leaks.

5. Inspect Oxygen Sensors

• Sub-step 1: Locate the upstream oxygen sensor (before the catalytic converter) and visually inspect the wiring for wear or damage.
• Sub-step 2: Use a multimeter to test the sensor's voltage output while the engine is running. Compare the readings to the manufacturer’s specifications.
• Sub-step 3: If the sensor is faulty, replace it with a new one.