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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative terminal of the battery for safety.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug gap tool
• Remove the engine cover if necessary.
• Locate the spark plug for cylinder 1. Typically, it's positioned near the front of the engine.
• Use the socket set to carefully remove the spark plug.
• Inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary.
• Properly gap the new spark plug according to manufacturer specifications.
• Install the new spark plug and torque it to the manufacturer’s specifications.

3. Check and Replace Ignition Coil

• Tools Required: Socket set
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil by unscrewing the bolts holding it in place.
• Inspect the ignition coil for physical damage or corrosion.
• Install a new ignition coil and securely fasten it.
• Reconnect the electrical connector.

4. Inspect Fuel Injector

• Tools Required: Fuel pressure gauge, socket set
• Locate the fuel injector for cylinder 1.
• Remove the fuel injector's electrical connector.
• Use the fuel pressure gauge to check for proper fuel pressure while cranking the engine.
• If the fuel injector is clogged or malfunctioning, replace it with a new unit.

5. Test Engine Compression

• Tools Required: Compression tester
• Remove the spark plug for cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine for several seconds and record the compression reading.
• Compare the reading to manufacturer specifications. If it is low, further investigation of the engine internals may be necessary.