what does the P0302 code mean for my Toyota Highlander Third Generation (2014-2019)

Solution

1. Preparation

• Gather tools: OBD-II scanner, spark plug socket, multimeter, compression tester, fuel injector cleaner.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect and Replace Spark Plug

1. Disconnect the negative battery terminal.
2. Remove the engine cover if applicable.
3. Locate cylinder 2's spark plug (refer to the vehicle's service manual for specific location).
4. Remove the spark plug using a spark plug socket and ratchet.
5. Inspect the spark plug for fouling, wear, or damage; replace if necessary.
   • Torque new spark plug to specification (typically around 13-15 lb-ft).
6. Reinstall the spark plug and engine cover if removed.

3. Test and Replace Ignition Coil

1. Disconnect the ignition coil connector for cylinder 2.
2. Use a multimeter to check the primary and secondary resistance of the coil (refer to specifications in the service manual).
3. If the coil is faulty, replace it with a new one (ensure proper part compatibility).
4. Reconnect the ignition coil connector.

4. Inspect Fuel Injector

1. Locate the fuel injector for cylinder 2.
2. Use a noid light or multimeter to check for injector pulse; replace the injector if it is not receiving a signal.
3. If needed, clean the fuel injector using a fuel injector cleaner or replace it.

5. Compression Test

1. Remove the spark plug for cylinder 2.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine a few times and read the compression gauge.
4. If compression is low, further investigation is necessary for potential internal engine issues.