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

Solution

1. Preparation

• Gather tools: OBD-II scanner, spark plug socket, torque wrench, compression tester, multimeter, and a basic socket set.
• Ensure the vehicle is in a safe, well-ventilated area and the engine is cool.

2. Inspect and Replace Spark Plugs

• Remove Engine Cover: Use the socket set to unbolt and remove the engine cover.
• Remove Spark Plug: Use the spark plug socket to carefully unscrew the spark plug from cylinder 1.
• Inspect Spark Plug: Check for signs of wear, oil deposits, or carbon buildup.
• Replace if Necessary: If worn, replace with the manufacturer-recommended spark plug. Torque to specifications (typically around 15-25 Nm).

3. Check and Replace Ignition Coil

• Inspect Ignition Coil: Remove the ignition coil from cylinder 1 after pulling off the electrical connector.
• Test Coil with Multimeter: Measure the resistance according to the specifications (typically around 0.5-1.5 ohms) to confirm functionality.
• Replace if Necessary: If faulty, install a new ignition coil and ensure it is securely connected.

4. Inspect Fuel Injector

• Access Fuel Injector: If necessary, remove any components obstructing access to the fuel injector for cylinder 1.
• Test Fuel Injector: Use a multimeter to check resistance; clean or replace the injector if clogged or damaged.
• Reassemble Components: Ensure all components are securely reinstalled after inspection or replacement.

5. Perform Compression Test

• Remove Spark Plug Again: Take out the spark plug for cylinder 1.
• Attach Compression Tester: Screw the compression tester into the spark plug hole.
• Crank Engine: Crank the engine for about 5 seconds and record the reading. It should be within manufacturer specifications (usually around 140-200 psi).
• Analyze Results: If readings are low, further investigation into engine internals may be necessary.