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Engine-Codes – Mercury – P0720 Mercury

P0720 Mercury Code - Output Shaft Speed Sensor Circuit Malfunction

Quick Answer

The P0720 diagnostic trouble code (DTC) specifically pertains to a malfunction in the output shaft speed sensor circuit of a Mercury vehicle. Common causes include Faulty output shaft speed sensor, Damaged or corroded wiring/connectors in the sensor circuit, Issues with the transmission control module (TCM). 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
P0720 Mercury indicates Output Shaft Speed Sensor Circuit Malfunction.
Common causes
Common causes include Faulty output shaft speed sensor, Damaged or corroded wiring/connectors in the sensor circuit, Issues with the transmission control module (TCM).
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 11, 2024
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Code P0720 Mercury Description

The P0720 diagnostic trouble code (DTC) specifically pertains to a malfunction in the output shaft speed sensor circuit of a Mercury vehicle. The output shaft speed sensor is a vital component of the transmission system that monitors the speed of the transmission output shaft. This information is crucial for the vehicle's onboard computer to determine gear shifting and torque converter lock-up strategies.

OBDII Code P0720 Mercury - Output Shaft Speed Sensor Circuit Malfunction
P0720 Mercury Code - Output Shaft Speed Sensor Circuit Malfunction

Common Causes of P0720 Mercury

  1. Faulty output shaft speed sensor
  2. Damaged or corroded wiring/connectors in the sensor circuit
  3. Issues with the transmission control module (TCM)
  4. Electrical problems such as short circuits or open circuits
  5. Mechanical issues affecting the sensor's operation

Symptoms of P0720 Mercury

  1. Rough or delayed gear shifts
  2. Poor acceleration
  3. Reduced fuel efficiency
  4. Harsh or erratic shifting
  5. Transmission slippage

How to Fix P0720 Mercury

  1. Diagnose the issue by performing a comprehensive scan of the vehicle's onboard computer to retrieve the fault codes and pinpoint the problem.
  2. Inspect the output shaft speed sensor, wiring, and connectors for any signs of damage, corrosion, or poor connections.
  3. Replace the faulty output shaft speed sensor if necessary, ensuring the new sensor is properly installed and calibrated.
  4. Repair or replace any damaged wiring or connectors in the sensor circuit.
  5. Test drive the vehicle to verify that the issue has been resolved and clear any remaining fault codes from the computer's memory.

Cost to Fix P0720 Mercury

The typical repair costs for addressing a P0720 code can vary depending on the specific issue and the vehicle's make and model. On average, the cost of replacing an output shaft speed sensor ranges from $100 to $300, including parts and labor. Additional costs may apply if wiring repairs or TCM diagnostics are required. It's essential to consider the specific diagnosis time and labor rates at auto repair shops, which can range from $80 to $150 per hour. Rates may vary based on location, the vehicle's complexity, and the technician's expertise. For a more accurate estimate, it's advisable to consult with a local auto repair shop.

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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 P0720 Mercury Code

1. What are the common symptoms of OBDII code P0720 on a Mercury vehicle?

The common symptoms of OBDII code P0720 on a Mercury include erratic speedometer readings, harsh shifting of the transmission, and the transmission going into limp mode.

2. What could cause the Output Shaft Speed Sensor Circuit Malfunction in a Mercury?

Possible causes of the P0720 code on a Mercury can include a faulty output shaft speed sensor, damaged wiring or connectors in the circuit, or issues with the transmission control module.

3. How can I diagnose the Output Shaft Speed Sensor Circuit Malfunction in my Mercury?

Diagnosing the P0720 code involves using a scan tool to read the code, checking the output shaft speed sensor and its wiring for any visible damage, and testing the sensor's resistance and output signal.

4. Can a bad output shaft speed sensor cause other problems in my Mercury?

Yes, a faulty output shaft speed sensor can cause issues such as incorrect gear shifting, reduced fuel efficiency, and potential damage to the transmission if left unresolved.

5. What are some repair tips for fixing the Output Shaft Speed Sensor Circuit Malfunction on a Mercury?

Repair tips for addressing the P0720 code can include replacing the faulty output shaft speed sensor, repairing any damaged wiring or connectors, and clearing the error code with a scan tool.

6. Is it safe to continue driving my Mercury with the P0720 code present?

It is not recommended to continue driving your Mercury with the P0720 code active, as it can lead to transmission issues and potential safety hazards. It's best to address the problem promptly.

7. How much does it typically cost to repair the Output Shaft Speed Sensor Circuit Malfunction on a Mercury?

The cost of repairing the P0720 code on a Mercury can vary depending on the extent of the issue and whether you do the repairs yourself or take it to a mechanic. Costs typically range from $100 to $300.

8. Can I reset the P0720 code on my Mercury without fixing the issue?

While you can clear the P0720 code using a scan tool, it is not advisable to do so without addressing the underlying problem, as it may lead to further damage and continued transmission issues.

9. Will disconnecting the battery reset the P0720 code on my Mercury?

Disconnecting the battery may temporarily clear the P0720 code, but it is not a recommended method for resolving the issue. The code is likely to return once the problem persists.

10. How long does it take to repair the Output Shaft Speed Sensor Circuit Malfunction on a Mercury?

The repair time for the P0720 code can vary depending on the complexity of the issue and your level of experience. A professional mechanic may take around 1-2 hours to diagnose and fix the problem.

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