why does my Skoda Octavia's check engine light flash when I'm driving

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety.
• Allow engine to cool before starting work.

2. Inspect Ignition System

• Tools Required: Socket set, torque wrench.
• Remove the engine cover if applicable.
• Inspect spark plugs for wear; replace if necessary (Torque specification: 15 Nm).
• Check ignition coils for cracks or damage; replace faulty coils.

3. Check for Vacuum Leaks

• Tools Required: Vacuum gauge or smoke machine.
• Visually inspect all vacuum hoses for cracks or disconnections.
• Use a smoke machine to detect leaks in the intake manifold or vacuum lines.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Locate the fuel pressure test port on the fuel rail.
• Attach the gauge and turn the ignition to the "ON" position without starting the engine to check the pressure (specification varies by engine, refer to service manual).
• If pressure is low, inspect the fuel pump and filter.

5. Inspect Exhaust System

• Tools Required: Jack and jack stands, exhaust pipe cutter (if necessary).
• Raise the vehicle safely.
• Inspect the exhaust system for any visible damage or blockages.
• Use a hammer to lightly tap the catalytic converter; listen for rattling sounds indicating internal failure.

6. Verify Sensor Operation

• Tools Required: Multimeter.
• Disconnect the MAF and oxygen sensors.
• Test the sensors according to the specifications in the service manual.
• Replace any sensors that do not meet specifications.