how to fix a P0302 code on a Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug gap tool.
• Remove the ignition coil by unscrewing the retaining bolts and gently pulling it out.
• Remove the spark plug using the socket set and inspect it for wear, carbon buildup, or damage.
• If necessary, replace the spark plug with a new one, ensuring it is gapped correctly to the manufacturer specifications (typically around 0.043 inches for this model).
• Reinstall the ignition coil and torque the bolts to the manufacturer’s specifications (usually around 7.2 ft-lbs).

3. Test and Replace Ignition Coil (if faulty)

• Tools Required: Multimeter.
• Test the ignition coil’s primary and secondary resistance using a multimeter. Compare the readings to the specifications in the service manual.
• If the coil is out of specification, replace it with a new part.
• Reconnect the ignition coil and ensure all connections are secure.

4. Check and Replace Fuel Injector (if needed)

• Tools Required: Fuel injector puller (if necessary), socket set.
• Disconnect the fuel injector connector and remove the mounting bolts.
• If the injector is clogged or malfunctioning, replace it with a new one.
• Reinstall the injector, ensuring to connect the fuel line securely.

5. Compression Test (if misfire persists)

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 2.
• Insert the compression tester and crank the engine for a few seconds.
• Compare the compression reading to the manufacturer's specifications (generally around 150-200 psi).
• If the reading is low, further investigation into the engine's internal components may be needed.