how to fix Tesla Model 3 Original (2017-2023) P0302 misfire code

Tesla Model 3 Highland (2024-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0302

3 min read

586 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 Tesla Model 3. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0302

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Allow the engine to cool before removing spark plugs to avoid burns.

Symptoms

•Check engine light illuminated
•Rough idle or engine vibration
•Loss of power during acceleration
•Decreased fuel efficiency
•Engine stalling in some cases

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0302 code.
2
Inspect the ignition coils and spark plugs for visible damage or wear.
3
Check the wiring and connections to the ignition components for continuity and corrosion.
4
Monitor the fuel trim levels using diagnostic software to assess fuel delivery to cylinder 2.
5
Perform a compression test on cylinder 2 to check for mechanical issues.
6
Inspect the fuel injector for proper operation and any blockage.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

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
•Torque wrench
•Socket set
•Fuel injector tester
•Dielectric grease

Parts Required

•Spark plug (compatible with Tesla Model 3)
•Ignition coil (for cylinder 2)
•Fuel injector (if needed)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0302 code.
2
Inspect the ignition coils and spark plugs for visible damage or wear.
3
Check the wiring and connections to the ignition components for continuity and corrosion.
4
Monitor the fuel trim levels using diagnostic software to assess fuel delivery to cylinder 2.
5
Perform a compression test on cylinder 2 to check for mechanical issues.
6
Inspect the fuel injector for proper operation and any blockage.

Solution

1. Preparation

Gather tools and parts for the repair.
Disconnect the negative battery terminal to prevent electrical shorts.
Ensure the vehicle is on a level surface and secure with wheel chocks.

2. Inspect and Replace Spark Plug

Tools Required: Spark plug socket, ratchet, torque wrench, dielectric grease.
Remove the engine cover (if applicable) to access the spark plugs.
Using the spark plug socket, carefully remove the spark plug from cylinder 2.
Inspect the spark plug for signs of wear (e.g., carbon fouling, electrode damage).
If necessary, replace the spark plug with a new one that meets OEM specifications.
Apply a small amount of dielectric grease to the spark plug boot to ensure a good seal.
Torque the new spark plug to the manufacturer's specifications (typically around 15-20 lb-ft).

3. Inspect and Replace Ignition Coil

Tools Required: Socket set, ratchet.
Remove the ignition coil from cylinder 2 by unscrewing the retaining bolts.
Inspect the ignition coil for cracks or damage.
If defective, replace the ignition coil with a new OEM or compatible part.
Reinstall the ignition coil and ensure it is secured properly.

4. Test Fuel Injector

Tools Required: Fuel injector tester (if applicable).
Remove the fuel injector from cylinder 2.
Use a fuel injector tester to check the injector's spray pattern and operation.
Clean or replace the injector if it is clogged or malfunctioning.

5. Reassemble and Reconnect Battery

Reinstall any components removed during the repair process.
Reconnect the negative battery terminal securely.
Start the vehicle and allow it to idle.