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

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

• Ensure the vehicle is parked on a flat surface and the ignition is off.
• Gather tools and parts required for the repair.
• Disconnect the vehicle's high-voltage battery for safety.

2. Inspect and Replace Spark Plug

• Remove the engine cover if necessary.
• Disconnect the spark plug wire or coil pack from cylinder 1.
• Use a spark plug socket to remove the old spark plug.
  • Tools Required: Spark plug socket, ratchet, torque wrench.
• Inspect the spark plug for signs of wear (e.g., carbon buildup, damage).
• Install a new spark plug (correct type as specified by the manufacturer) and torque to specifications (typically 18-20 lb-ft).
• Reconnect the spark plug wire or coil pack.

3. Check and Replace Ignition Coil

• Disconnect the ignition coil connector for cylinder 1.
• Remove the ignition coil securing bolts and lift the coil out.
• Inspect the ignition coil for damage or cracks. If defective, replace with a new ignition coil.
• Reinstall the ignition coil and secure it with bolts. Reconnect the wiring harness.

4. Inspect Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Remove the fuel rail if necessary to access the injector.
• Inspect fuel injector for clogs or damage. Use a multimeter to check for continuity if needed.
• Replace the fuel injector if faulty.
  • Ensure proper seating and connection before reassembly.

5. Perform Compression Test

• Remove the spark plug for cylinder 1 again.
• Insert a compression tester into the spark plug hole.
• Crank the engine and read the compression value. Compare with manufacturer specifications.
• If the compression is low, further diagnostics may be required to check for internal engine issues.