how do I fix P0301 code in my Toyota Camry Seventh Generation (2012-2017)

Solution

1. Preparation

• Gather tools and parts: OBD-II scanner, socket set, multimeter, compression tester, new spark plug, ignition coil (if needed), fuel injector cleaner.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Replace Spark Plug

1. Locate Spark Plug: Remove the engine cover if necessary to access cylinder 1's spark plug.
2. Disconnect Ignition Coil: Unplug the electrical connector from the ignition coil.
3. Remove Ignition Coil: Unscrew the ignition coil using a socket wrench and carefully lift it out.
4. Remove Spark Plug: Use a spark plug socket and ratchet to unscrew the spark plug. Inspect for damage or excessive wear.
5. Install New Spark Plug: Insert the new spark plug and torque it to the manufacturer’s specifications (usually around 13-16 lb-ft).
6. Reinstall Ignition Coil: Place the ignition coil back into position and reconnect the electrical connector.

3. Check and Replace Ignition Coil

1. Test Coil Resistance: Use a multimeter to check the resistance of the ignition coil. If it is out of specification, replace the coil.
2. Install New Ignition Coil: Follow the same steps as in the spark plug replacement to install a new ignition coil if required.

4. Clean or Replace Fuel Injector

1. Access Fuel Injector: Remove the intake manifold if necessary to access the fuel injector for cylinder 1.
2. Remove Fuel Injector: Disconnect the fuel line and electrical connector. Unscrew and remove the injector.
3. Inspect Injector: Clean the injector using a fuel injector cleaner or replace it if it is faulty.
4. Reinstall Injector: Install the cleaned or new injector, reconnect the electrical connector, and secure the fuel line.

5. Verify Compression

1. Remove Spark Plug: If not already done, remove the spark plug from cylinder 1.
2. Insert Compression Tester: Screw the compression tester into the spark plug hole.
3. Crank Engine: Crank the engine to obtain a compression reading. Compare the reading to specifications (typically 150-200 psi).
4. Address Issues: If the compression is low, further diagnosis is needed to check for mechanical issues.