AutoCodes – Mercury – P2631 Mercury

P2631 Mercury Code - Oxygen Sensor Positive Current Trim Circuit High Bank 2 Sensor 1

Quick Answer

A resistor is installed in the Universal Heated Oxygen Sensor (HO2S) connector for part to part variance. Common causes include Faulty Heated Oxygen Sensor (HO2S), Heated Oxygen Sensor (HO2S) harness is open or shorted, Heated Oxygen Sensor (HO2S) 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: P2631 Mercury indicates Oxygen Sensor Positive Current Trim Circuit High Bank 2 Sensor 1.
Common causes: Common causes include Faulty Heated Oxygen Sensor (HO2S), Heated Oxygen Sensor (HO2S) harness is open or shorted, Heated Oxygen Sensor (HO2S) 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 1,593

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 22, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2631 Mercury Description

A resistor is installed in the Universal Heated Oxygen Sensor (HO2S) connector for part to part variance. The Powertrain Control Module (PCM) determines the value of this resistor by taking multiple measurements of the resistor during each ignition ON event. The PCM uses this value in order to compensate for the variance in the pumping current signal. The test fails if the PCM determines the resistance value is too high.

OBDII Code P2631 Mercury - Oxygen Sensor Positive Current Trim Circuit High Bank 2 Sensor 1 - AutoCodes.com — P2631 Mercury Code - Oxygen Sensor Positive Current Trim Circuit High Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P2631 Mercury?

Faulty Heated Oxygen Sensor (HO2S)
Heated Oxygen Sensor (HO2S) harness is open or shorted
Heated Oxygen Sensor (HO2S) circuit poor electrical connection

How to Fix the DTC P2631 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 P2631 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.

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Need more information on how to fix the P2631 Mercury code? Get Access to Factory Service Manuals

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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 P2631 Mercury Code

1. What does the OBDII code P2631 mean on a Mercury vehicle?

P2631 indicates an issue with the Oxygen Sensor Positive Current Trim Circuit High for Bank 2 Sensor 1, meaning the sensor is reporting an abnormally high signal.

2. What are the common symptoms of the P2631 code?

Symptoms may include poor fuel economy, rough idling, engine hesitation, and the illumination of the Check Engine Light.

3. What causes the P2631 code to appear?

Common causes include a faulty oxygen sensor, damaged wiring or connectors in the circuit, or issues with the engine control module (ECM).

4. How can I fix the P2631 code on my Mercury?

Inspect and repair any damaged wiring or connectors, replace the Bank 2 Sensor 1 oxygen sensor if faulty, and update or reprogram the ECM if necessary.

5. Can driving with the P2631 code damage my Mercury's engine?

While it may not cause immediate damage, ignoring this code can lead to poor engine performance and potential long-term damage due to improper air-fuel mixture.

6. How do I know if the Bank 2 Sensor 1 oxygen sensor is faulty?

Use a diagnostic scan tool to check live data for the sensor. If the readings are erratic or outside normal parameters, the sensor may be faulty.

7. Is the P2631 code specific to Mercury vehicles?

No, the P2631 code can appear on other makes and models, but the exact diagnosis and repair steps may vary slightly.

8. How much does it cost to repair the P2631 code?

Repair costs depend on the issue but typically range from $150 to $400, including parts and labor for replacing the oxygen sensor or fixing wiring.

9. Can a vacuum leak cause the P2631 code?

While unlikely, a vacuum leak can indirectly affect oxygen sensor readings and should be checked if other causes are ruled out.

10. Do I need professional help to fix the P2631 code?

If you're experienced with automotive diagnostics and repairs, you may be able to fix it yourself. Otherwise, it's recommended to seek professional assistance.