FAULTBASE
NEWSASKCars
© 2025 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
Home/Cars/Toyota/Highlander/Third Generation (2014-2019)/how to diagnose a P0302 code in my Toyota Highlander Third Generation (2014-2019)

how to diagnose a P0302 code in my Toyota Highlander Third Generation (2014-2019)

Toyota Highlander Third Generation (2014-2019)

Severity: highDifficulty: mediumError Code: P03022-4 hours
3 min read
597 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 removing spark plugs or ignition coils.

Symptoms

  • •Check engine light illuminated
  • •Rough idle or engine vibration
  • •Loss of power during acceleration
  • •Poor fuel economy
  • •Increased exhaust emissions
  • •Engine stalling intermittently

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm P0302 and check for any additional codes.
  2. 2Inspect spark plugs and ignition coils visually for signs of wear, damage, or carbon buildup.
  3. 3Test ignition coil operation by swapping it with another cylinder and observing if the misfire moves.
  4. 4Check fuel injector performance by using a fuel pressure gauge to ensure proper fuel delivery.
  5. 5Perform a compression test on cylinder 2 to determine if there are any internal engine issues.
  6. 6Inspect vacuum hoses and intake manifold for any leaks that may affect cylinder 2's performance.
  7. 7Examine the engine timing to ensure it is set properly and not causing a misfire.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

  1. Remove the ignition coil from cylinder 2 by unbolting and disconnecting the electrical connector.
  2. Use a spark plug socket to remove the spark plug from cylinder 2.
  3. Inspect the old spark plug for wear; replace it if it appears damaged or worn.
  4. Apply anti-seize lubricant on the new spark plug threads and install it into cylinder 2, tightening to manufacturer specifications (typically around 13-15 lb-ft).
  5. Reinstall the ignition coil over the new spark plug.

3. Inspect and Replace Ignition Coil (if necessary)

  1. If the ignition coil was found to be faulty during testing, remove it from cylinder 2.
  2. Install a new ignition coil, ensuring it fits securely.
  3. Reconnect the electrical connector and secure with the bolt.

4. Check and Replace Fuel Injector (if necessary)

  1. Disconnect the fuel supply line and electrical connector from the fuel injector of cylinder 2.
  2. Remove the old fuel injector using an appropriate tool.
  3. Install the new fuel injector, ensuring it is seated properly.
  4. Reconnect the fuel supply line and electrical connector.

5. Verify Engine Timing (if applicable)

  1. Remove timing cover if necessary to access timing components.
  2. Align timing marks according to service manual specifications.
  3. Adjust timing as needed to ensure proper alignment.

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
  • Ratchet and socket set
  • Torque wrench
  • Fuel pressure gauge
  • Standard hand tools (screwdrivers, pliers)

Parts Required

  • Spark plug(s)
  • Ignition coil(s) (if needed)
  • Fuel injector(s) (if needed)

Additional Information

Error CodeP0302
Component

Engine

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

6 items

Parts

3 items

Related Faults

Discover similar issues

  1. why is my Toyota Highlander shaking when I accelerate

    Learn how to diagnose and fix shaking during acceleration in Toyota Highlander. Step-by-step guide with diagnostic procedures and repair instructions.

    Component:Suspension
    Symptoms
    • •Shaking or vibrations felt in the steering wheel or throughout the vehicle during acceleration
    • •Increased noise coming from the engine or drivetrain
    • +{count} more
  2. my Toyota Highlander shakes when braking what's causing it

    Learn how to diagnose and fix shaking during braking in Toyota Highlander. Step-by-step guide with symptoms, diagnostic steps, and repair instructions...

    Component:Brakes
    Symptoms
    • •Shaking or vibrating sensation in the steering wheel or brake pedal when braking
    • •Uneven wear on brake pads
    • +{count} more
  3. how to resolve P0011 timing issue in Toyota Highlander Third Generation (2014-2019)

    P0011

    Learn how to diagnose and fix P0011 timing issue in Toyota Highlander (2014-2019). Step-by-step guide with diagnostic procedures and repair instructio...

    Component:Engine
    Symptoms
    • •Check engine light illuminated
    • •Engine may experience rough idling
    • +{count} more
  4. what does it mean if my Toyota Highlander shows C1231 code

    C1231

    Learn how to diagnose and fix C1231 ABS issue in Toyota Highlander. Step-by-step guide with diagnostic procedures and repair instructions.

    Component:Brakes
    Symptoms
    • •ABS warning light illuminated on the dashboard
    • •Poor braking performance or increased stopping distance
    • +{count} more
  5. how to troubleshoot the power windows on Toyota Highlander Third Generation (2014-2019)

    Learn how to troubleshoot and fix power window issues on Toyota Highlander (2014-2019). Step-by-step guide with diagnostic steps and repair instructio...

    Component:Electrical
    Symptoms
    • •Power windows do not respond when the switch is pressed
    • •Window moves slowly or stops partway
    • +{count} more
  6. how to reset my Toyota Highlander Third Generation (2014-2019) tire pressure light

    Learn how to reset the tire pressure light on your 2014-2019 Toyota Highlander. Step-by-step guide with diagnostic steps and safety tips.

    Component:Electrical
    Symptoms
    • •Tire pressure warning light illuminated on the dashboard
    • •Incorrect tire pressure indicated on the monitor
    • +{count} more

Share this solution

Comments

Sign in to share your thoughts

Sign In

No comments yet

Be the first to share your thoughts

Back to Generation