AutoCodes – Lincoln – P1726 Lincoln

P1726 Lincoln 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 Lincoln 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 Lincoln indicates Insufficient Engine Speed Decrease During Self-Test.
Common causes: Common causes for P1726 Lincoln 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 419

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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

How to Fix the DTC P1726 Lincoln?

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 Lincoln 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 Lincoln code?

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

Need Help with the Code?

Get the P1726 Lincoln 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 Lincoln Code

What does the OBDII code P1726 indicate for a Lincoln vehicle?

P1726 indicates "Insufficient Engine Speed Decrease During Self-Test," which means the engine speed did not decrease as expected during the diagnostic self-test.

What are common symptoms of the P1726 code?

Common symptoms include the check engine light being illuminated, rough idling, poor acceleration, and in some cases, stalling.

What could cause the P1726 code to trigger?

Causes may include a malfunctioning throttle position sensor, issues with the engine control module (ECM), vacuum leaks, or problems with the idle air control valve.

How can I diagnose the P1726 code?

To diagnose P1726, start by checking for other stored codes, inspect the throttle position sensor and wiring, look for vacuum leaks, and perform a visual inspection of engine components.

What repairs might be needed to fix the P1726 code?

Repairs may involve replacing a faulty throttle position sensor, fixing vacuum leaks, reprogramming or replacing the ECM, or repairing wiring issues.

Can I drive my Lincoln with the P1726 code?

While it may be drivable, it's not recommended to ignore the P1726 code, as it can lead to poor engine performance and potential further damage.

How much does it typically cost to repair the P1726 code?

Repair costs can vary widely, but you might expect to spend anywhere from $100 to $800 depending on the specific repairs needed, such as sensor replacement or ECM issues.

Are there any preventative measures to avoid the P1726 code?

Regular maintenance, including checking and cleaning the throttle body, inspecting sensors, and addressing engine performance issues promptly, can help prevent the P1726 code from occurring.

What should I do if I clear the P1726 code but it comes back?

If the code returns after clearing, it indicates an ongoing issue that needs to be diagnosed and repaired. It's advisable to seek professional assistance if you cannot identify the problem.