how to fix P0301 misfire code in Tesla Model 3 Highland (2024-present)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, dielectric grease.
• Remove the ignition coil from cylinder 1:
  • Unplug the electrical connector.
  • Remove the mounting bolts.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for signs of wear or fouling. Replace if necessary.
• Install the new spark plug, ensuring it is gapped correctly to manufacturer specifications (typically around 0.030 inches for Tesla).
• Torque the spark plug to the recommended specification (typically 12-15 lb-ft).
• Apply dielectric grease to the ignition coil connector before reinstallation.

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set.
• If the ignition coil is faulty:
  • Remove the ignition coil from cylinder 1 as outlined in the previous step.
  • Install the new ignition coil and secure it with the bolts.
  • Reconnect the electrical connector.

4. Check Fuel Injector

• Tools Required: Fuel pressure gauge, injector cleaning kit (if cleaning is required).
• Connect the fuel pressure gauge to the fuel rail and turn the ignition on (do not start the engine) to check for proper fuel pressure.
• If the pressure is low, inspect the fuel lines and pump.
• If the injector is suspected to be clogged, remove it and either clean it or replace it with a new one.

5. Reassemble and Test

• Reconnect the battery.
• Start the engine and monitor for any check engine light reappearance.
• Test drive the vehicle to ensure proper operation.