how to fix persistent P0301 misfire code in Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0301 cylinder 1 misfire in Tesla Model S. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the engine cover if applicable.
• Using a socket, carefully remove the spark plug from cylinder 1.
• Inspect the spark plug for fouling or wear; replace if necessary.
• Install a new spark plug, ensuring it is gapped correctly to manufacturer specifications (typically around 0.028-0.032 inches).
• Torque the spark plug to the manufacturer's specifications, usually around 15-20 lb-ft.

3. Examine and Replace Ignition Coil

• Tools Required: Socket set
• Disconnect the ignition coil connector from cylinder 1.
• Remove the ignition coil from its mount.
• If testing has shown the coil to be faulty, replace it with a new one.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Inspect and Test Fuel Injector

• Tools Required: Fuel pressure gauge, multimeter
• Disconnect the fuel injector connector from cylinder 1.
• Test the injector with a multimeter to ensure it is receiving the correct voltage.
• If the injector is faulty, remove it from the fuel rail and replace it with a new one.
• Reconnect the fuel injector connector.

5. Conduct Compression Test

• Tools Required: Compression tester
• Remove all spark plugs to avoid engine strain during testing.
• Insert the compression tester into cylinder 1 and crank the engine.
• Compare the compression reading against the manufacturer's specifications (usually around 150-200 psi).
• If the compression is low, further investigation into possible internal engine damage is required.