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

Solution

1. Preparation

• Gather tools and parts, ensuring you have an OBD-II scanner, spark plug socket, torque wrench, multimeter, and compression tester.
• Disconnect the negative battery terminal to avoid electrical shocks.

2. Replace Spark Plug

1. Remove the engine cover if necessary.
2. Using a spark plug socket, remove the spark plug from cylinder 1.
3. Inspect the old spark plug; replace it if fouled or worn beyond specifications (generally, gap should be 0.043 inches).
4. Install the new spark plug, hand-tighten, then torque to 13 lb-ft (17.6 Nm) using a torque wrench.

3. Inspect and Replace Ignition Coil

1. Disconnect the wiring harness from the ignition coil for cylinder 1.
2. Remove the ignition coil by unscrewing the mounting bolts (typically 10 mm).
3. Install the new ignition coil in reverse order of removal and ensure it is securely fastened.

4. Check and Replace Fuel Injector

1. If the injector is faulty, disconnect the fuel line using a fuel line disconnect tool.
2. Remove the fuel injector from the intake manifold (may require removal of the intake manifold depending on vehicle design).
3. Install the new fuel injector, ensuring proper alignment and sealing.
4. Reconnect the fuel line and check for leaks.

5. Compression Test (If Necessary)

1. Remove the spark plug from cylinder 1.
2. Insert the compression tester into the spark plug socket.
3. Crank the engine for a few seconds and read the compression value. It should be within the manufacturer's specifications (typically around 180 psi).
4. If compression is low, further engine disassembly may be required to investigate potential internal damage.