how to fix the P0301 misfire code on Tesla Model 3 Original (2017-2023)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, fuel pressure gauge.
• Disconnect the negative terminal of the battery to avoid electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil cover (if applicable).
• Remove the ignition coil from cylinder 1 using a ratchet and socket.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear, carbon buildup, or fouling.
• Replace with a new spark plug, ensuring the gap is set to manufacturer specifications (typically 0.040 inches for Tesla).
• Reinstall the ignition coil and cover.

3. Check and Replace Ignition Coil (if necessary)

• If the ignition coil shows signs of damage or wear, replace it with a new unit.
• Ensure it is seated properly and reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Remove the fuel rail to access the fuel injector for cylinder 1.
• Inspect the injector for blockages or damage.
• Clean the injector using a fuel injector cleaner or replace it if necessary.
• Reinstall the injector and fuel rail, ensuring all seals are intact.

5. Compression Test (if needed)

• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare with manufacturer specifications (around 140-200 psi).
• If compression is low, further engine diagnostics may be required.

6. Reconnect and Test

• Reconnect the negative battery terminal.
• Start the vehicle and check for the check engine light.
• Use the OBD-II scanner to clear the P0301 code and monitor for reoccurrence.