why is my Tesla Model S Plaid/Refresh (2021-present) throwing P0301 code

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 necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the ignition is off.
• Disconnect the vehicle’s 12V battery to prevent any electrical issues.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, ratchet, gap gauge.
• Remove the engine cover if applicable.
• Locate the spark plug for cylinder 1 (refer to the owner's manual for precise location).
• Use the spark plug socket and ratchet to remove the old spark plug.
• Inspect the old spark plug for signs of wear or damage.
• Set the gap on the new spark plug to manufacturer's specifications.
• Install the new spark plug, tightening it to the specified torque (typically 15-20 Nm).

3. Check and Replace Ignition Coil (if necessary)

• Tools Required: Socket set, torque wrench.
• Disconnect the electrical connector from the ignition coil for cylinder 1.
• Remove the ignition coil by unscrewing the retaining bolts.
• Inspect the old ignition coil for signs of failure.
• Install the new ignition coil and secure it with the bolts, tightening to the specified torque.
• Reconnect the electrical connector.

4. Test Fuel Injector

• Tools Required: Noid light or multimeter.
• Disconnect the fuel injector connector for cylinder 1.
• Connect a noid light or multimeter to check for electrical signal.
• If there is no signal, trace back to the wiring harness or ECU.
• If the signal is present but the injector is not functioning, replace the fuel injector.

5. Address Vacuum Leaks

• Tools Required: Smoke tester or soapy water solution.
• Inspect vacuum lines visually for cracks or disconnections.
• Use a smoke tester to identify any vacuum leaks around the intake manifold or hoses.
• Replace any damaged vacuum lines as necessary.