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Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/how to deal with P0302 code on Toyota Highlander Fourth Generation (2020-present)

how to deal with P0302 code on Toyota Highlander Fourth Generation (2020-present)

Toyota Highlander Fourth Generation (2020-present)

Severity: highDifficulty: mediumError Code: P03022-4 hours
3 min read
567 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
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical components.
  • ⚠Allow the engine to cool before starting any maintenance work.

Symptoms

  • •Check engine light illuminated
  • •Rough idle
  • •Loss of power during acceleration
  • •Engine stalling or hesitating
  • •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 and ignition coil for cylinder 2 for signs of wear or damage.
  3. 3Perform a visual inspection of wiring and connectors related to the ignition system.
  4. 4Check fuel injector operation for cylinder 2 using a noid light or fuel injector tester.
  5. 5Conduct a compression test on cylinder 2 to rule out internal engine issues.
  6. 6Inspect the air intake and vacuum hoses for leaks that may affect cylinder performance.

Solution

Solution

1. Preparation

  • Gather all necessary tools and parts.
  • Disconnect the negative terminal of the battery for safety.
  • Ensure the engine is cool before starting any work.

2. Replace Spark Plug and Ignition Coil

  • Tools Required: Socket set, torque wrench, spark plug gap tool
  • Remove the engine cover if applicable.
  • Disconnect the electrical connector from the ignition coil on cylinder 2.
  • Remove the ignition coil bolt using a socket and ratchet, then pull the coil out.
  • Remove the spark plug using a spark plug socket and ratchet.
  • Install the new spark plug, ensuring it is gapped correctly to the manufacturer's specifications (typically 0.043 inches for Toyota).
  • Reinstall the ignition coil, tightening the bolt to the specified torque (usually around 80 in-lbs).
  • Reconnect the electrical connector to the ignition coil.

3. Check and Replace Fuel Injector (if necessary)

  • Tools Required: Fuel injector puller, socket set
  • Disconnect the fuel injector electrical connector.
  • Remove the retaining clips and the fuel rail bolts.
  • Remove the fuel rail to access the fuel injector.
  • Pull out the old fuel injector and replace it with a new one, lubricating the O-rings with clean engine oil.
  • Reinstall the fuel rail and secure it with bolts.

4. Reassemble and Reconnect Battery

  • Reconnect the negative terminal of the battery.
  • Replace any engine covers that were removed.
  • Start the engine and allow it to reach operating temperature.

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
  • Socket set
  • Torque wrench
  • Spark plug gap tool
  • Fuel injector puller

Parts Required

  • New spark plug
  • New ignition coil
  • New fuel injector (if necessary)

Additional Information

Error CodeP0302
Component

Engine

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

5 items

Parts

3 items

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