AutoCodes – Mercury – B1966 Mercury

B1966 Mercury Code - A/C Post Heater Sensor Circuit Failure

Quick Answer

The Dual Automatic Temperature Control (DATC) Module monitors the A/C Post Heater Sensor. Common causes include Faulty A/C Post Heater Sensor, A/C Post Heater Sensor harness is open or shorted, A/C Post Heater Sensor circuit poor electrical connection. 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: B1966 Mercury indicates A/C Post Heater Sensor Circuit Failure.
Common causes: Common causes include Faulty A/C Post Heater Sensor, A/C Post Heater Sensor harness is open or shorted, A/C Post Heater Sensor circuit poor electrical connection.
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 527

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 31, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1966 Mercury Description

The Dual Automatic Temperature Control (DATC) Module monitors the A/C Post Heater Sensor. The DATC sets the OBDII code when the A/C Post Heater Sensor is not to factory specifications.

OBDII Code B1966 Mercury - A/C Post Heater Sensor Circuit Failure - AutoCodes.com — B1966 Mercury Code - A/C Post Heater Sensor Circuit Failure

What does this mean?

What are the Possible Causes of the DTC B1966 Mercury?

Faulty A/C Post Heater Sensor
A/C Post Heater Sensor harness is open or shorted
A/C Post Heater Sensor circuit poor electrical connection
Faulty Dual Automatic Temperature Control (DATC) Module

How to Fix the DTC B1966 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 B1966 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 B1966 Mercury code?

Need more information on how to fix the B1966 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1966 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 B1966 Mercury Code

1. What are the common symptoms of OBDII code B1966 in a Mercury related to A/C Post Heater Sensor Circuit Failure?

- Common symptoms include irregular A/C operation, lack of heat or cooling, and possible illumination of the check engine light.

2. What can cause the A/C Post Heater Sensor Circuit Failure code B1966 in a Mercury?

- Potential causes may include a faulty post heater sensor, damaged wiring or connectors, or issues with the heating and air conditioning system.

3. How can I diagnose the A/C Post Heater Sensor Circuit Failure code B1966 in my Mercury?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, testing the post heater sensor, inspecting wiring for damage, and verifying proper operation of the A/C system.

4. Can I drive my Mercury with the A/C Post Heater Sensor Circuit Failure code B1966?

- It is generally not recommended to drive with this code active, as it can lead to further damage to the heating and air conditioning system and affect overall vehicle performance.

5. How can I repair the A/C Post Heater Sensor Circuit Failure code B1966 in my Mercury?

- Repair steps may include replacing the faulty post heater sensor, repairing damaged wiring or connectors, clearing the code with an OBDII scanner, and testing the system for proper function.

6. Are there any DIY tips for troubleshooting the A/C Post Heater Sensor Circuit Failure code B1966 in my Mercury?

- DIY tips may include checking for loose or damaged connections, inspecting the sensor for visible damage, and ensuring proper refrigerant levels in the A/C system.

7. How much does it cost to fix the A/C Post Heater Sensor Circuit Failure code B1966 in a Mercury?

- Repair costs can vary depending on the root cause of the issue, but it may involve parts replacement, labor charges, and potential diagnostic fees at a repair shop.

8. Can resetting the OBDII code B1966 in my Mercury fix the A/C Post Heater Sensor Circuit Failure issue?

- Resetting the code may temporarily clear the check engine light, but it will not address the underlying problem causing the A/C Post Heater Sensor Circuit Failure.

9. Is the A/C Post Heater Sensor Circuit Failure code B1966 in a Mercury a common issue?

- While not extremely common, experiencing this code can occur due to various factors related to the heating and air conditioning system in the vehicle.

10. Can a faulty A/C Post Heater Sensor affect the overall performance of my Mercury?

- Yes, a faulty sensor can impact the proper functioning of the A/C system, leading to discomfort for occupants and potential issues with the vehicle's climate control system.