AutoCodes – Mercury – C1991 Mercury

C1991 Mercury Code - Plant Ride Height Setting And/Or Tests Incomplete

Quick Answer

The Air Suspension Control Module monitors the Plant Ride Height Setting. Common causes include Calibrate the ride heights. 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: C1991 Mercury indicates Plant Ride Height Setting And/Or Tests Incomplete.
Common causes: Common causes include Calibrate the ride heights.
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 901

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 Dec 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1991 Mercury Description

The Air Suspension Control Module monitors the Plant Ride Height Setting. The Air Suspension Control Module sets the OBDII code when the Plant Ride Height Setting is not to factory specifications.

OBDII Code C1991 Mercury - Plant Ride Height Setting And/Or Tests Incomplete - AutoCodes.com — C1991 Mercury Code - Plant Ride Height Setting And/Or Tests Incomplete

What does this mean?

What are the Possible Causes of the DTC C1991 Mercury?

Calibrate the ride heights

How to Fix the DTC C1991 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1991 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 C1991 Mercury code?

Need more information on how to fix the C1991 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1991 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 C1991 Mercury Code

1. What are the common symptoms of OBDII code C1991 in a Mercury related to Plant Ride Height Setting And/Or Tests Incomplete?

- Common symptoms include the suspension system not functioning properly, uneven ride height, and the vehicle feeling unstable while driving.

2. What can cause the OBDII code C1991 in a Mercury indicating Plant Ride Height Setting And/Or Tests Incomplete?

- Possible causes can include faulty suspension components, sensor issues, calibration errors, or a disrupted communication between the suspension control module and other systems.

3. How can I diagnose the OBDII code C1991 in a Mercury for Plant Ride Height Setting And/Or Tests Incomplete?

- Diagnosing this code typically involves using a diagnostic scanner to retrieve the specific error codes, inspecting the suspension system for any visible issues, and checking the sensor readings related to ride height.

4. Are there any simple repair tips for the OBDII code C1991 in a Mercury related to Plant Ride Height Setting And/Or Tests Incomplete?

- Basic repair tips include checking and adjusting the ride height settings, ensuring proper sensor connections, and clearing the error codes to see if they recur after a reset.

5. Is it safe to drive with the OBDII code C1991 indicating Plant Ride Height Setting And/Or Tests Incomplete in a Mercury?

- It is not recommended to drive with this code active, as it can affect the vehicle's stability and handling. It's best to address the underlying issue promptly.

6. Can resetting the OBDII code C1991 in a Mercury related to Plant Ride Height Setting And/Or Tests Incomplete solve the problem?

- Resetting the code may temporarily clear the warning, but if the underlying issue causing the code is not addressed, it is likely to reappear.

7. How much does it typically cost to repair the OBDII code C1991 in a Mercury for Plant Ride Height Setting And/Or Tests Incomplete?

- The cost of repairs can vary depending on the specific cause of the issue, but it may involve sensor replacement, recalibration, or suspension component repairs, which can range from a few hundred to over a thousand dollars.

8. Can a DIY enthusiast fix the OBDII code C1991 indicating Plant Ride Height Setting And/Or Tests Incomplete in a Mercury?

- While some basic checks and adjustments can be done by DIY enthusiasts, diagnosing and repairing the underlying causes of this code may require advanced tools and expertise, so professional help is often recommended.

9. How long does it typically take to repair the OBDII code C1991 in a Mercury related to Plant Ride Height Setting And/Or Tests Incomplete?

- The repair time can vary based on the specific issue, but it may take a few hours to a day for diagnosis, parts replacement, and recalibration, depending on the complexity of the problem.

10. Are there any recalls or technical service bulletins related to the OBDII code C1991 in a Mercury for Plant Ride Height Setting And/Or Tests Incomplete?

- It's recommended to check with a Mercury dealership or online resources for any related recalls or technical service bulletins that may address the specific issue causing this code.