what does it mean if my Toyota Camry XV50 (2012-2017) has a code P0301

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter.
• Ensure the engine is cool and disconnect the negative battery terminal for safety.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1 using a socket set.
• Take out the spark plug using a spark plug socket.
• Inspect the spark plug for carbon deposits or damage; replace if necessary.
• Install a new spark plug (use OEM specifications) and torque to manufacturer's specifications (typically around 13-15 ft-lbs).
• Reinstall the ignition coil securely.

3. Test and Replace Ignition Coil (if needed)

• Use a multimeter to check the resistance of the ignition coil; compare with manufacturer specifications.
• If the resistance is out of range, replace the ignition coil with a new one.
• Ensure proper installation and connections.

4. Inspect and Test Fuel Injector

• Disconnect the fuel injector connector and check for voltage using a multimeter while cranking the engine.
• If there is no voltage, check the wiring and connectors for damage.
• If voltage is present, test the injector's resistance; replace if it is out of specifications.
• Reconnect all components after inspection.

5. Perform Compression Test

• Remove the spark plug from cylinder 1 and attach the compression tester.
• Crank the engine and record the compression reading; it should be within the manufacturer's specification (typically 150-200 psi).
• If readings are low, further investigation may be needed for internal engine issues.