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Engine-Codes – Ford – P1266 Ford

P1266 Ford Code - Cylinder #6 High To Low Side Short

Quick Answer

The P1266 Ford diagnostic trouble code indicates an issue with Cylinder #6 High To Low Side Short. Common causes include Faulty fuel injector, Damaged wiring in the fuel injector circuit, Corrosion in the electrical connections. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1266 Ford indicates Cylinder #6 High To Low Side Short.
Common causes
Common causes include Faulty fuel injector, Damaged wiring in the fuel injector circuit, Corrosion in the electrical connections.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P1266 Ford Description

The P1266 Ford diagnostic trouble code indicates an issue with Cylinder #6 High To Low Side Short. This means that there is a short circuit present in the wiring or components related to cylinder #6 in the fuel injector circuit. The fuel injector is responsible for delivering the precise amount of fuel into the combustion chamber for ignition, and any interruption in this process can have significant effects on the vehicle's performance.

OBDII Code P1266 Ford - Cylinder #6 High To Low Side Short
P1266 Ford Code - Cylinder #6 High To Low Side Short

Common Causes of P1266 Ford

  1. Faulty fuel injector
  2. Damaged wiring in the fuel injector circuit
  3. Corrosion in the electrical connections
  4. Engine control module (ECM) malfunction
  5. Short circuit in the wiring harness

Symptoms of P1266 Ford

  1. Engine misfires
  2. Rough idling
  3. Decreased fuel efficiency
  4. Engine hesitation
  5. Stalling

How to Fix P1266 Ford

  1. Diagnose the root cause of the issue using a diagnostic scanner to pinpoint the exact source of the short circuit.
  2. Inspect the wiring harness and electrical connections for any signs of damage or corrosion. Repair or replace as needed.
  3. Test the fuel injector for proper operation and replace if necessary.
  4. Clear the trouble code from the ECM's memory and test the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be required to identify any underlying issues with the ECM or other components.

Cost to Fix P1266 Ford

The cost of repairing a P1266 Ford diagnostic trouble code can vary depending on the specific cause of the issue and the extent of the repairs needed. Typically, the cost of parts for a fuel injector replacement can range from $150 to $300, while labor costs can add an additional $100 to $200. Overall, the total repair cost for this issue could range from $250 to $500.

What does this mean?

Tech Notes for P1266 Ford

Check valve cover wire harness connections first, including under the valve cover.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1266 Ford Code

1. What are the common symptoms of OBDII code P1266 Ford (Cylinder #6 High To Low Side Short)?

- Common symptoms include engine misfires, rough idling, loss of power, and illuminated check engine light.

2. What does the OBDII code P1266 Ford indicate?

- This code indicates a high to low side short in the fuel injector circuit of cylinder #6.

3. What are the possible causes of OBDII code P1266 Ford?

- Possible causes include a faulty fuel injector, wiring issues, poor electrical connections, or a problem with the Engine Control Module (ECM).

4. How can I diagnose the cause of OBDII code P1266 Ford?

- Diagnose by inspecting the wiring harness for damage, testing the fuel injector resistance, checking for proper voltage at the injector, and scanning the ECM for related codes.

5. Can I still drive my vehicle with OBDII code P1266 Ford?

- It is not recommended to drive the vehicle with this code active, as it can lead to engine performance issues and potential damage.

6. How can I repair OBDII code P1266 Ford?

- Repair options include replacing the faulty fuel injector, repairing any damaged wiring, ensuring proper electrical connections, and clearing the trouble code with a scan tool.

7. Are there any preventative maintenance tips to avoid OBDII code P1266 Ford?

- Regularly inspecting and maintaining the fuel injectors, wiring harness, and electrical connections can help prevent issues that trigger this trouble code.

8. Is it safe to reset the OBDII code P1266 Ford without fixing the underlying issue?

- While you can clear the code temporarily, it is important to address the root cause to prevent further engine problems and potential safety hazards.

9. How much does it cost to repair OBDII code P1266 Ford at a mechanic?

- Repair costs can vary depending on the exact cause of the issue, but expect to pay for parts and labor associated with diagnosing and fixing the problem.

10. Can OBDII code P1266 Ford affect fuel efficiency?

- Yes, this code can lead to decreased fuel efficiency due to improper fuel delivery to the affected cylinder, resulting in inefficient combustion.

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