how to fix P0301 code in Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative terminal of the battery to prevent electrical shock.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, gap gauge.
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts and lifting it out.
• Unscrew the spark plug using the spark plug socket.
• Inspect the spark plug for wear; if damaged or fouled, replace it with a new one, ensuring proper gap setting as per manufacturer specifications (typically around 0.043 inches for Toyota).
• Reinstall the spark plug and torque it to the manufacturer’s specification (usually around 13 ft-lbs).
• Reattach the ignition coil.

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, proceed to inspect the ignition coil.
• Tools Required: Multimeter.
• Test the ignition coil primary and secondary resistance with a multimeter; compare results with manufacturer specifications.
• If the ignition coil is faulty, replace it with a new one.
• Reconnect any electrical connectors and ensure it is securely attached.

4. Check and Clean Fuel Injector

• If the issue persists, check the fuel injector for cylinder 1.
• Tools Required: Noid light or injector tester.
• Disconnect the fuel injector connector and check for proper voltage with the noid light during cranking.
• If no voltage is detected, inspect the wiring harness for damage.
• If the injector is clogged, consider cleaning it using a fuel injector cleaning kit or replace it if necessary.

5. Perform Compression Test

• If misfire continues after checking spark plugs and ignition coils, conduct a compression test.
• Tools Required: Compression gauge.
• Remove the spark plug and insert the compression gauge into the cylinder.
• Crank the engine and note the compression reading; compare it to the manufacturer's specs.
• If compression is low, further investigation into valve seals or piston rings may be necessary.