how to fix P0301 code on my Toyota Camry XV70 (2018-2024)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter
• Disconnect the negative battery cable to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plug

1. Remove the engine cover if applicable using a socket set.
2. Locate the spark plug for cylinder 1 (usually near the front of the engine).
3. Use a socket wrench to remove the spark plug.
4. Inspect the spark plug for wear, carbon buildup, or damage; replace if necessary.
5. Install the new spark plug by hand first, then torque it to the manufacturer’s specifications (typically 13-15 ft-lbs).

3. Inspect and Replace Ignition Coil

1. Disconnect the wiring harness from the ignition coil for cylinder 1.
2. Remove the ignition coil using a socket wrench.
3. Inspect the ignition coil for cracks or damage; replace if necessary.
4. Install a new ignition coil, ensuring it is seated properly.
5. Reconnect the wiring harness.

4. Check Fuel Injector Operation

1. Disconnect the fuel injector connector for cylinder 1.
2. Use a multimeter to check for proper voltage at the connector while cranking the engine.
3. If no voltage is detected, trace wiring back to the ECM for faults.
4. If voltage is present, use a fuel injector tester to verify that the injector is functioning.
5. Replace the fuel injector if it fails the test.

5. Perform Compression Test

1. Remove the spark plug and ignition coil from cylinder 1.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine for a few seconds while monitoring the gauge.
4. Compare the reading to the manufacturer’s specifications; low compression indicates possible internal engine issues.
5. If low, further inspection of the piston rings and valves is necessary.