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P1273 Ford Code - Cylinder #3 High To Low Side Open

Quick Answer

The P1273 Ford diagnostic trouble code indicates that there is a high to low side open circuit in cylinder #3 of the engine. Common causes include Faulty fuel injector in cylinder #3, Damaged wiring or connectors leading to the fuel injector, Issues with the engine control module (ECM). 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
P1273 Ford indicates Cylinder #3 High To Low Side Open.
Common causes
Common causes include Faulty fuel injector in cylinder #3, Damaged wiring or connectors leading to the fuel injector, Issues with the engine control module (ECM).
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 08, 2024
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Code P1273 Ford Description

The P1273 Ford diagnostic trouble code indicates that there is a high to low side open circuit in cylinder #3 of the engine. This means that there is an issue with the fuel injector or the wiring associated with it in cylinder #3. In a multi-port fuel injection system, each cylinder has its own fuel injector that delivers fuel to the combustion chamber. When the fuel injector in cylinder #3 fails to operate properly, it can lead to a variety of performance issues and potentially cause damage to the engine if left unresolved.

OBDII Code P1273 Ford - Cylinder #3 High To Low Side Open
P1273 Ford Code - Cylinder #3 High To Low Side Open

Common Causes of P1273 Ford

  1. Faulty fuel injector in cylinder #3
  2. Damaged wiring or connectors leading to the fuel injector
  3. Issues with the engine control module (ECM)
  4. Corrosion or debris affecting the fuel injector operation
  5. Electrical issues in the fuel injector circuit

Symptoms of P1273 Ford

  1. Engine misfires or runs rough
  2. Decreased engine performance or power
  3. Poor fuel economy
  4. Increased emissions
  5. Check engine light illuminated

How to Fix P1273 Ford

  1. Diagnose the specific cause of the high to low side open circuit in cylinder #3 using a diagnostic scanner and multimeter.
  2. Inspect the fuel injector in cylinder #3 for proper operation and replace if necessary.
  3. Check the wiring and connectors associated with the fuel injector for damage or corrosion and repair as needed.
  4. Test the ECM to ensure it is functioning correctly and reprogram if necessary.
  5. Clear the diagnostic trouble code and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P1273 Ford

The typical repair costs for addressing a P1273 Ford diagnostic trouble code can vary depending on the specific cause of the issue. In general, replacing a fuel injector can cost between $150 and $300 per injector, while repairing wiring or connectors may range from $50 to $150. Diagnosing the issue and labor costs can add an additional $100 to $300 to the total repair bill. Overall, the total cost for resolving a P1273 Ford code can range from $300 to $750, depending on the extent of the repairs needed. It is recommended to consult with a qualified mechanic or auto repair shop to obtain a more accurate cost estimate based on the specific circumstances of your vehicle.

What does this mean?

Tech Notes for P1273 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 P1273 Ford Code

1. What are the common symptoms of OBDII code P1273 in a Ford, indicating Cylinder #3 High To Low Side Open?

- Common symptoms include engine misfires, rough idling, loss of power, and potentially decreased fuel efficiency.

2. What can cause the OBDII code P1273 in a Ford related to Cylinder #3 High To Low Side Open?

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

3. How can I diagnose the OBDII code P1273 in a Ford cylinder #3 issue?

- Diagnosis involves checking the wiring and connections related to the fuel injector in cylinder #3, testing the injector itself, and inspecting the ECM for any faults.

4. Is it safe to continue driving with OBDII code P1273 in a Ford indicating Cylinder #3 High To Low Side Open?

- It is not recommended to drive with this issue, as it can lead to further damage to the engine and potentially pose a safety risk. It's best to address the problem promptly.

5. Can a DIY enthusiast repair the OBDII code P1273 issue in a Ford related to Cylinder #3 High To Low Side Open?

- Depending on the root cause, some DIY repairs may be possible, such as checking and cleaning electrical connections or replacing a faulty fuel injector. However, complex issues may require professional assistance.

6. What are some repair tips for resolving the OBDII code P1273 in a Ford cylinder #3 problem?

- Ensure all electrical connections are secure, inspect the wiring for any damage, test the fuel injector in cylinder #3, and consider resetting the ECM after repairs are made.

7. Will resetting the ECM clear the OBDII code P1273 in a Ford for Cylinder #3 High To Low Side Open?

- Resetting the ECM may clear the code temporarily, but if the underlying issue is not addressed, the code is likely to reappear. It's essential to diagnose and repair the root cause of the problem.

8. How much does it typically cost to repair the OBDII code P1273 in a Ford cylinder #3 issue?

- The cost of repairs can vary depending on the exact cause of the problem, the labor rates in your area, and whether you choose to do the repairs yourself or seek professional help. Costs may range from a few hundred to over a thousand dollars.

9. Can a faulty fuel injector be the sole reason for the OBDII code P1273 in a Ford cylinder #3 problem?

- While a faulty fuel injector is a common cause of this code, it's essential to thoroughly diagnose the issue to rule out other potential causes like wiring problems or ECM issues before replacing the injector.

10. How urgent is it to address the OBDII code P1273 in a Ford related to Cylinder #3 High To Low Side Open?

- It is recommended to address this issue promptly to prevent further damage to the engine and ensure optimal performance of your vehicle. Continuing to drive with this problem unresolved can lead to more significant issues down the line.

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