how to fix a misfire code P0301 on my 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

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, fuel injector cleaner.
• Safety Warnings: Disconnect the 12V battery before working on electrical components to prevent shocks or shorts.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Using a socket wrench, remove the spark plug from cylinder 1.
• Inspect the old spark plug for signs of wear or fouling; replace with a new spark plug (OEM recommended).
• Torque the new spark plug to manufacturer's specifications (typically around 15-20 ft-lbs).
• Reinstall the engine cover.

3. Inspect and Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil for cylinder 1.
• Remove the ignition coil by unscrewing the retaining bolts.
• Install a new ignition coil and secure it with bolts.
• Reconnect the electrical connector.

4. Clean or Replace Fuel Injector

• Remove the fuel injector connector for cylinder 1.
• To clean, use a fuel injector cleaner per the instructions on the product. If ineffective, replace the injector.
• Reinstall the fuel injector and reconnect the electrical connector.

5. Perform Compression Test

• Remove the spark plug for cylinder 1 again.
• Insert the compression tester into the spark plug hole and crank the engine.
• Record the compression reading; it should be within manufacturer specifications (usually 150-200 psi).
• If compression is low, further inspection is needed for possible head gasket or piston issues.