AutoCodes – Mercury – P1726 Mercury

P1726 Mercury Code - Insufficient Engine Speed Decrease During Self-Test

Quick Answer

The Powertrain Control Module (PCM) monitors the engine speed during the Key On Engine Running (KOER) self-test. Common causes for P1726 Mercury include wiring or connector problems, a faulty related sensor or actuator, and control module or calibration issues. 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: P1726 Mercury indicates Insufficient Engine Speed Decrease During Self-Test.
Common causes: Common causes for P1726 Mercury include wiring or connector problems, a faulty related sensor or actuator, and control module or calibration issues.
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.

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Code Popularity 443

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jul 19, 2021

Description
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1726 Mercury Description

The Powertrain Control Module (PCM) monitors the engine speed during the Key On Engine Running (KOER) self-test. When the PCM detects engine speed higher than a calibrated speed, the KOER self-test is aborted and this Diagnostic Trouble Code (DTC) sets.

OBDII Code P1726 Mercury - Insufficient Engine Speed Decrease During Self-Test - AutoCodes.com — P1726 Mercury Code - Insufficient Engine Speed Decrease During Self-Test

How to Fix the DTC P1726 Mercury?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

The P1726 code will be set if during the Key On Engine Running (KOER) the engine RPM increases above the maximum threshold for a self-test.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1726 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1726 Mercury code?

Need more information on how to fix the P1726 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1726 Mercury code diagnosed by a professional: Find a repair shop in your area

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 P1726 Mercury Code

What does the OBDII code P1726 mean for a Mercury vehicle?

The code P1726 indicates that the vehicle's engine speed did not decrease sufficiently during the self-test, which can suggest issues with the engine's performance or the vehicle's transmission system.

What are common symptoms of the P1726 code?

Common symptoms may include poor acceleration, engine stalling, erratic idling, and potential warning lights on the dashboard, such as the Check Engine Light.

What could cause the P1726 code to trigger?

Possible causes include a malfunctioning throttle position sensor, issues with the transmission control module, problems with engine timing, or general engine performance issues.

How can I diagnose the P1726 code?

To diagnose this code, start with a thorough inspection of the throttle position sensor and related wiring, check for vacuum leaks, and use a scan tool to monitor live data from the engine and transmission.

What are some common repairs for the P1726 code?

Repairs may include replacing a faulty throttle position sensor, fixing wiring or connector issues, reprogramming or replacing the transmission control module, or addressing any underlying engine performance problems.

Can I drive my vehicle with the P1726 code?

While you can drive the vehicle, it is not advisable as it may lead to further engine issues or reduced performance. It is best to address the code promptly.

Will clearing the P1726 code reset the Check Engine Light?

Clearing the code may turn off the Check Engine Light temporarily, but if the underlying issue is not resolved, the light will likely come back on after driving for a while.

Is P1726 code specific to certain Mercury models?

While the P1726 code can appear in various Mercury models, it may be more common in certain vehicles with specific engine and transmission configurations. Always refer to the vehicle's service manual for model-specific information.

Can other OBDII codes accompany the P1726 code?

Yes, it is common for the P1726 code to appear alongside other codes related to engine performance or transmission issues, which can provide further insight into the problem.

How can I prevent the P1726 code from returning after repairs?

To prevent the P1726 code from returning, ensure all repairs are done correctly, perform regular maintenance, check for any software updates for the vehicle's ECU, and monitor the vehicle's performance closely.