how to fix P0301 misfire code Tesla Model S Plaid/Refresh (2021-present)

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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool before starting.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Multimeter
• Fuel pressure gauge

2. Inspect and Replace Ignition Components

• Sub-step 1: Disconnect the negative battery cable to ensure safety.
• Sub-step 2: Remove the engine cover if applicable to access the ignition coils.
• Sub-step 3: Remove the ignition coil for cylinder 1. Inspect for cracks or damage.
• Sub-step 4: Replace the ignition coil with a new, compatible part. Torque the bolts to the manufacturer's specifications (typically around 10-15 Nm).
• Sub-step 5: Replace the spark plug in cylinder 1 if it shows signs of wear, ensuring it's gapped correctly as per manufacturer's specifications.

3. Inspect Fuel Injector

• Sub-step 1: If the ignition components are in good condition, proceed to check the fuel injector for cylinder 1.
• Sub-step 2: Disconnect the fuel injector electrical connector.
• Sub-step 3: Use a multimeter to test the resistance of the fuel injector. Compare the reading with the manufacturer's specifications.
• Sub-step 4: If the fuel injector is faulty, replace it with a new one, ensuring it is seated correctly.

4. Perform Compression Test (if necessary)

• Sub-step 1: Remove the spark plug for cylinder 1.
• Sub-step 2: Insert the compression tester into the spark plug hole.
• Sub-step 3: Crank the engine and record the compression reading. Compare it to the manufacturer's specifications.
• Sub-step 4: If compression is low, further investigation of the cylinder's mechanical integrity may be required.

5. Verify Fuel Pressure

• Sub-step 1: Connect the fuel pressure gauge to the fuel rail.
• Sub-step 2: Turn the ignition to the "ON" position (do not start) and observe the fuel pressure reading.
• Sub-step 3: Compare the reading with the manufacturer’s specifications and replace the fuel pump or filter if necessary.