how to fix P0302 code in Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Locate cylinder 2 spark plug (refer to vehicle manual for exact location).
  3. Use a socket wrench to remove the spark plug.
  4. Inspect the spark plug for damage or excessive wear.
  5. If necessary, replace with a new spark plug (use OEM specifications).
  6. Torque the new spark plug to the manufacturer’s specifications (typically 13-15 lb-ft).

3. Test and Replace Ignition Coil

• Sub-steps:
  1. Disconnect the ignition coil harness for cylinder 2.
  2. Use a multimeter to check the resistance of the ignition coil (check specifications in the service manual).
  3. If the coil is faulty, remove it using a socket wrench and replace it with a new one.
  4. Reconnect the ignition coil harness.

4. Inspect and Replace Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector harness for cylinder 2.
  2. Use an injector tester or a multimeter to check for proper operation.
  3. If the injector is faulty, remove it and replace it with a new one (ensure it is compatible with the engine).
  4. Reconnect the fuel injector harness.

5. Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 2.
  2. Insert a compression gauge into the spark plug hole.
  3. Crank the engine for a few seconds and record the compression reading.
  4. Compare to manufacturer specifications (typically 180-220 psi).
  5. If compression is low, further investigation may be needed (e.g., valve issues, piston rings).