how to fix P0303 code in Ford Explorer Fifth Generation (2011-2019)

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0303

3 min read

566 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 P0303 cylinder 3 misfire in Ford Explorer (2011-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0303

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

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

Symptoms

•Check engine light illuminated
•Rough idle or engine shaking
•Decreased acceleration power
•Poor fuel economy
•Engine stalling or hesitation during acceleration

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0303 and check for any additional codes.
2
Inspect spark plug and ignition coil of cylinder 3 for wear or damage.
3
Check fuel injector operation for cylinder 3 using a noid light or by listening for clicks.
4
Perform a compression test on cylinder 3 to assess engine health.
5
Examine wiring and connectors related 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
•Spark plug socket
•Torque wrench
•Ratchet and socket set
•Multimeter
•Compression gauge
•Fuel injector puller

Parts Required

•Spark plug
•Ignition coil
•Fuel injector

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0303 and check for any additional codes.
2
Inspect spark plug and ignition coil of cylinder 3 for wear or damage.
3
Check fuel injector operation for cylinder 3 using a noid light or by listening for clicks.
4
Perform a compression test on cylinder 3 to assess engine health.
5
Examine wiring and connectors related to the ignition coil and fuel injector for damage or corrosion.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and the engine is cool.
Disconnect the battery (negative terminal) to prevent electrical shock.

2. Inspect and Replace Spark Plug

Tools Required: Spark plug socket, torque wrench, ratchet.
Remove the ignition coil for cylinder 3 using a ratchet and socket.
Remove the spark plug using a spark plug socket.
Inspect the spark plug for damage or excessive wear; replace if necessary.
Install the new spark plug to the manufacturer’s specified torque (usually around 13-15 lb-ft).
Reinstall the ignition coil and ensure it clicks into place.

3. Inspect and Replace Ignition Coil

If the spark plug is in good condition, proceed to check the ignition coil.
Remove the ignition coil from cylinder 3.
Test the ignition coil with a multimeter to check for proper resistance (consult service manual for specifications).
Replace the ignition coil if it does not meet specifications.
Reinstall the new ignition coil.

4. Check and Replace Fuel Injector

Disconnect the fuel line and electrical connector from the fuel injector for cylinder 3.
Remove the fuel injector using appropriate tools (may require a special puller).
Inspect the injector for clogging or damage.
Replace with a new fuel injector as needed.
Reconnect the fuel line and electrical connector.

5. Perform Compression Test (if necessary)

If misfire persists, perform a compression test.
Remove the spark plug and insert the compression gauge into cylinder 3.
Crank the engine to check the compression reading.
If compression is low, further investigation into internal engine components may be necessary.