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

Learn how to diagnose and fix P0301 cylinder 1 misfire in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, compression tester, socket set, torque wrench, multimeter.
• Ensure the vehicle is parked on a level surface, and the engine is cool before starting work.

2. Inspect and Replace Ignition Components

• Step 1: Remove the engine cover (if applicable).
• Step 2: Disconnect the electrical connector from the ignition coil for cylinder 1.
• Step 3: Remove the ignition coil by unbolting it (typically 10mm).
• Step 4: Remove the spark plug using a spark plug socket and ratchet.
• Step 5: Inspect the spark plug for signs of wear or fouling. Replace it if necessary (specify the correct NGK or Bosch part number as per the OEM specifications).
• Step 6: Install a new spark plug, tightening to the manufacturer's specifications (usually around 15-20 ft-lbs).
• Step 7: Reinstall the ignition coil and reconnect the electrical connector.

3. Perform a Compression Test

• Step 1: Remove the spark plug from cylinder 1 again.
• Step 2: Insert the compression tester into the spark plug hole.
• Step 3: Crank the engine for a few seconds and record the compression reading.
• Step 4: Compare the reading to the manufacturer’s specifications (typically 150-200 psi). If the compression is low, further investigation into the piston rings or valves may be necessary.

4. Check and Repair Wiring

• Step 1: Inspect the wiring harness and connectors for cylinder 1.
• Step 2: Use a multimeter to check for continuity in the wiring to the ignition coil.
• Step 3: Repair or replace any damaged wiring or connectors as necessary.