my BMW 5 Series F10/F11 (2010-2017) has a check engine light and code P0302, how to fix?

BMW 5 Series F10/F11 (2010-2017)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0302

3 min read

538 words

Problem Statement

The BMW 5 Series F10/F11 (2010-2017) is experiencing a check engine light with trouble code P0302, indicating a misfire in cylinder 2.

Error Code

P0302

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

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

Symptoms

•Check engine light illuminated
•Rough idle
•Loss of power during acceleration
•Decreased fuel efficiency
•Engine vibration or shaking

Diagnostic Steps

1
Scan for additional error codes using an OBD-II scanner to identify any related issues.
2
Inspect the spark plug in cylinder 2 for wear or damage.
3
Check the ignition coil on cylinder 2 for proper functioning.
4
Examine the fuel injector for cylinder 2 for clogs or malfunction.
5
Perform a compression test on cylinder 2 to check for mechanical issues.
6
Inspect the wiring and connectors to the ignition coil and fuel injector for damage or corrosion.

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
•Socket set
•Torque wrench
•Spark plug socket
•Multimeter
•Compression tester
•Fuel injector cleaning kit

Parts Required

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

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan for additional error codes using an OBD-II scanner to identify any related issues.
2
Inspect the spark plug in cylinder 2 for wear or damage.
3
Check the ignition coil on cylinder 2 for proper functioning.
4
Examine the fuel injector for cylinder 2 for clogs or malfunction.
5
Perform a compression test on cylinder 2 to check for mechanical issues.
6
Inspect the wiring and connectors to the ignition coil and fuel injector for damage or corrosion.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Tools Required: OBD-II scanner, socket set, torque wrench, spark plug socket, multimeter, compression tester, fuel injector cleaning kit.
Safety Warnings: Disconnect the battery before working on electrical systems.

2. Replace Spark Plug

Remove the engine cover to access the ignition coils.
Disconnect the ignition coil connector for cylinder 2.
Remove the ignition coil using a socket set.
Use a spark plug socket to remove the old spark plug from cylinder 2.
Inspect the new spark plug for proper gap (typically 0.032-0.036 inches for BMW).
Install the new spark plug and torque it to the manufacturer’s specifications (usually around 23 lb-ft).
Reinstall the ignition coil and reconnect the connector.

3. Check/Replace Ignition Coil

If the spark plug replacement did not resolve the issue, test the ignition coil using a multimeter to check for proper resistance.
If the ignition coil is faulty, replace it with a new one.
Reinstall and reconnect the ignition coil.

4. Inspect/Replace Fuel Injector

If the ignition coil is functioning correctly, remove the fuel injector for cylinder 2.
Clean the injector using a fuel injector cleaning kit or replace it if clogged or defective.
Reinstall the fuel injector and ensure it is properly connected.

5. Perform Compression Test

If misfire persists, perform a compression test on cylinder 2.
If compression is low, further investigation may be needed for internal engine issues (e.g., valve leaks, piston rings).