how to check for P0301 misfire code on Tesla Model S Original (2012-2020)?

Learn how to diagnose and fix P0301 cylinder 1 misfire in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools: OBD-II scanner, compression tester, spark plug socket, multimeter, fuel injector tester, and basic hand tools.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.

2. Check Ignition System

• Remove Ignition Coil: Disconnect the electrical connector and remove the bolt securing the ignition coil. Carefully pull the coil out of the cylinder head.
• Inspect Spark Plug: Using a spark plug socket, remove the spark plug from cylinder 1. Inspect for wear, carbon buildup, or damage. Replace if necessary.
• Replace Ignition Coil (if needed): If the coil is damaged, replace it with a new one ensuring it is seated correctly.

3. Perform Compression Test

• Insert Compression Tester: Screw the compression tester into the spark plug hole of cylinder 1.
• Crank Engine: Crank the engine for several seconds to get a compression reading. Note the value and compare it to the manufacturer's specifications.
• Evaluate Results: If compression is low, further engine diagnostics may be required.

4. Check Fuel Injector

• Test Fuel Injector: Connect the fuel injector tester to the injector of cylinder 1 while the ignition is on (do not start the car).
• Monitor Operation: Activate the injector with the tester and listen for a clicking sound indicating it is functioning properly. If it does not operate, replace the injector.

5. Reassemble and Clear Codes

• Reinstall Components: After inspection and repair, reinstall the ignition coil and spark plug. Ensure all connections are secure.
• Clear Codes: Use the OBD-II scanner to clear the P0301 code from the vehicle’s computer.