what should I do if my Tesla Model S Plaid/Refresh (2021-present) has a check engine light with 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.
• Disconnect the negative terminal of the battery to ensure safety during repairs.
• Allow the vehicle to cool down if it has been running.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench
• Remove the engine cover (if applicable) by unscrewing any retaining bolts.
• Locate cylinder 1 spark plug, identified from the vehicle's service manual.
• Use the spark plug socket to carefully remove the old spark plug.
• Inspect the spark plug for signs of fouling or wear; replace if necessary.
• Install the new spark plug, tightening to the manufacturer’s specified torque (usually around 18 ft-lbs for most vehicles).

3. Inspect and Replace Ignition Coil

• Tools Required: Ratchet, socket set
• Remove the ignition coil for cylinder 1 by unscrewing the mounting bolts.
• Inspect the ignition coil for cracks or damage.
• Replace with a new ignition coil if necessary.
• Reinstall the ignition coil and tighten to the manufacturer’s specified torque.

4. Check Fuel Injector

• Tools Required: Fuel pressure gauge, appropriate wrenches
• Disconnect the fuel line leading to the injector for cylinder 1, ensuring to relieve fuel pressure first.
• Use a fuel pressure gauge to check the fuel pressure; it should be within the manufacturer’s specifications.
• If pressure is low, inspect the fuel filter and fuel pump for issues.
• Inspect the fuel injector for clogs or malfunctions; replace if necessary.

5. Reassemble and Reconnect

• Reinstall any components or covers that were removed during the repair process.
• Reconnect the negative battery terminal.
• Start the vehicle and check for any persistent warning lights.