how to diagnose my Tesla Model S Original (2012-2020) with a P0301 code

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 necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the vehicle to cool if the engine has been running.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover (if applicable).
• Locate cylinder 1 spark plug and disconnect the ignition coil connector.
• Remove the ignition coil and spark plug.
• Inspect the spark plug for wear or damage; replace if necessary.
• Install a new spark plug, torquing it to the manufacturer’s specifications (typically around 15-20 lb-ft).
• Reinstall the ignition coil and connect the ignition connector.

3. Test Fuel Injector

• Tools Required: Noid light or injector tester.
• Locate the fuel injector for cylinder 1.
• Disconnect the fuel injector connector.
• Connect a noid light or injector tester to the connector and crank the engine.
• Observe if the light flashes (indicating the injector is firing). If not, further diagnose the wiring and ECU output.
• If the injector is faulty, replace it with a new one.

4. Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 1.
• Install the compression gauge into the spark plug hole.
• Crank the engine and take note of the compression reading.
• Compare the reading to the manufacturer’s specifications (typically around 150-200 psi). If compression is low, further inspection of valve seals, head gasket, or piston rings may be necessary.