how to fix P0301 code in my Toyota Camry XV50 (2012-2017)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery (negative terminal) to ensure safety.
• Allow the engine to cool down if it was recently running.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil from cylinder 1 by unbolting it and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear, carbon buildup, or damage; replace it if necessary.
• Apply a small amount of dielectric grease to the spark plug threads and install it, torquing it to the manufacturer's specifications (typically around 13 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Test Ignition Coil

• Tools Required: Multimeter.
• With the ignition coil removed, test its resistance using a multimeter according to the manufacturer's specifications.
• If the coil is faulty, replace it with a new one.
• Reinstall the ignition coil back onto the spark plug and connect the electrical connector.

4. Inspect Fuel Injector

• Tools Required: Fuel pressure gauge.
• Check the fuel pressure using a fuel pressure gauge to ensure it meets specifications.
• If the fuel pressure is low, check for clogged fuel filters or faulty fuel pumps.
• If the injector is suspected to be faulty, remove it and test it using a bench tester; replace if necessary.

5. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1 and install the compression tester.
• Crank the engine and observe the compression reading; it should be within the manufacturer's specified range.
• If compression is low, further engine diagnostics may be necessary to identify the issue (e.g., valve problems, head gasket failure).