how do I diagnose a P0301 code in my 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

• Ensure the vehicle is in a safe, stable position.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Gather necessary tools and parts.

2. Inspect and Replace Spark Plug

1. Remove the engine cover if applicable.
2. Locate and remove the spark plug from cylinder 1 using a spark plug socket.
   • Tools Required: Spark plug socket, ratchet, extension.
3. Inspect the spark plug for wear or carbon buildup. Replace if damaged.
4. Install a new spark plug, ensuring it is torqued to the manufacturer’s specifications (typically around 18 lb-ft).

3. Inspect and Replace Ignition Coil

1. Remove the ignition coil from cylinder 1 by disconnecting the electrical connector and unscrewing the mounting bolts.
   • Tools Required: Socket set, screwdriver.
2. Inspect the ignition coil for cracks or signs of overheating. Replace if necessary.
3. Install the new ignition coil, ensuring all connections are secure.

4. Check and Replace Fuel Injector

1. Disconnect the fuel line and electrical connector from the fuel injector in cylinder 1.
   • Safety Warnings: Relieve fuel system pressure before disconnecting the fuel line.
2. Remove the fuel injector and inspect it for clogs or damage.
3. Replace with a new fuel injector if needed, ensuring it is securely installed.

5. Perform Compression Test

1. Remove the spark plug from cylinder 1 again to gain access.
2. Insert a compression gauge into the spark plug hole and crank the engine several times.
3. Record the compression reading and compare it to manufacturer specifications (typically around 150-200 psi).
4. If readings are low, further investigation into the piston rings or valves may be required.