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Home/Cars/Toyota/Highlander/Third Generation (2014-2019)/what does it mean when my Toyota Highlander has a P0302 code

what does it mean when my Toyota Highlander has a P0302 code

Toyota Highlander Third Generation (2014-2019)

Severity: highDifficulty: mediumError Code: P03021-3 hours
3 min read
532 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0302 cylinder 2 misfire in Toyota Highlander. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0302
Component
Engine
Repair Time
1-3 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow the engine to cool before opening any components to prevent burns.

Symptoms

  • •Check engine light illuminated
  • •Rough engine idle
  • •Decreased acceleration and power
  • •Engine stalling during idle or low RPMs
  • •Poor fuel economy
  • •Increased exhaust emissions

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm P0302 and check for any additional codes.
  2. 2Inspect the spark plug in cylinder 2 for wear or damage.
  3. 3Check the ignition coil for cylinder 2 for proper function and signs of failure.
  4. 4Perform a visual inspection of the fuel injector for cylinder 2 for clogs or leaks.
  5. 5Conduct a compression test on cylinder 2 to assess engine health.
  6. 6Verify wiring and connectors related to the ignition system and fuel injector for any damage or corrosion.

Solution

Solution

1. Preparation

  • Gather tools and parts required for the repair.
  • Disconnect the negative battery terminal to prevent electrical shorts.
  • Allow the engine to cool down before proceeding.

2. Replace Spark Plug

  1. Remove the ignition coil from cylinder 2 by unscrewing the retaining bolts.
  2. Carefully pull the ignition coil out of the cylinder head.
  3. Use a spark plug socket to remove the old spark plug from cylinder 2.
  4. Inspect the new spark plug for correct gap specification and install it into cylinder 2.
  5. Reinstall the ignition coil onto the spark plug and secure it with retaining bolts.

3. Test Ignition Coil

  1. If the misfire persists after replacing the spark plug, test the ignition coil using a multimeter.
  2. Compare resistance readings against the manufacturer’s specifications.
  3. If out of spec, replace the ignition coil for cylinder 2.

4. Inspect and Clean Fuel Injector

  1. Remove the fuel injector from cylinder 2 by disconnecting the electrical connector and removing retaining clips.
  2. Inspect for clogs or leaks; clean the injector if necessary or replace it if damaged.
  3. Reinstall the fuel injector and reconnect the electrical connector.

5. Final Assembly and Testing

  1. Reconnect the negative battery terminal.
  2. Start the engine and allow it to reach operating temperature.
  3. Check for any new error codes and confirm that the check engine light is off.

Verification

After completing the repair, verify that the issue has been resolved:

  • Test the affected component to ensure it functions correctly
  • Check for any error codes or warning lights
  • Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • OBD-II scanner
  • Spark plug socket
  • Torque wrench
  • Multimeter
  • Basic hand tools (screwdrivers, socket set)

Parts Required

  • Spark plug for cylinder 2
  • Ignition coil (if necessary)
  • Fuel injector (if necessary)

Additional Information

Error CodeP0302
Component

Engine

Repair Time

1-3 hours

Difficulty

medium

Severity

high

Tools

5 items

Parts

3 items

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