AutoCodes – Mercury – B2872 Mercury

B2872 Mercury Code - Tire Pressure Sensor Fault

Quick Answer

The Tire Pressure Monitor (TPM) system monitors the air pressure in the 4 road tires with wheel-mounted tire pressure sensors. Common causes include Low tire pressure, Tire pressure sensor is missing or damaged, Spare tire is installed as a road wheel. 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: B2872 Mercury indicates Tire Pressure Sensor Fault.
Common causes: Common causes include Low tire pressure, Tire pressure sensor is missing or damaged, Spare tire is installed as a road wheel.
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 1,519

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 Feb 18, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B2872 Mercury Description

The Tire Pressure Monitor (TPM) system monitors the air pressure in the 4 road tires with wheel-mounted tire pressure sensors. The sensors transmit radio frequency signals to the Smart Junction Box (SJB) approximately every 60 seconds when the vehicle speed exceeds 20 mph (32 km/h). If vehicle is stationary for more than 30 minutes, the sensor will enter into a sleep mode and stop transmitting.
Each tire pressure sensor transmission is compared against a low-pressure limit (pressure listed on vehicle certification label minus 25 percent, which will be about 6-9 psi). If it is determined that the tire pressure has fallen below this limit, the SJB sends a message to the instrument cluster, which then illuminates the low pressure warning indicator and displays the appropriate message(s) in the message center (if equipped).

OBDII Code B2872 Mercury - Tire Pressure Sensor Fault - AutoCodes.com — B2872 Mercury Code - Tire Pressure Sensor Fault

What does this mean?

What are the Possible Causes of the DTC B2872 Mercury?

Low tire pressure
Tire pressure sensor is missing or damaged
Spare tire is installed as a road wheel
Incorrect tire pressure sensor is installed
Tire pressure sensor installed incorrectly
Faulty Tire Pressure Sensor

How to Fix the DTC B2872 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

When the tire pressure warning light comes on solid and message center displays LOW TIRE PRESSURE, check the air pressure of all tires and adjust to the specified cold pressure listed on vehicle certification label (found on drivers door or door pillar). Drive the vehicle at 20 mph (32 km/h) for at least 2 minutes. If the vehicle has been stationary for more than 30 minutes, a TPM sensor Activation procedure may be needed. When the tire pressure warning light flashes for 70 seconds and then remains illuminated, after bulb-check has been performed and message center displays warning messages, there is a malfunction in the TPM system.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2872 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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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 B2872 Mercury Code

1. What does the OBDII code B2872 mean for a Mercury?

The B2872 code indicates a fault with one or more tire pressure sensors in the vehicle's Tire Pressure Monitoring System (TPMS).

2. What are the common symptoms of the B2872 code?

Symptoms include the TPMS warning light staying on, inaccurate tire pressure readings, or no readings displayed on the dashboard.

3. What causes the B2872 code to appear?

This code can be caused by a malfunctioning tire pressure sensor, a dead sensor battery, damaged wiring, or a problem with the TPMS module.

4. Can low tire pressure trigger the B2872 code?

No, low tire pressure itself does not trigger this code, but it may cause the TPMS light to illuminate. The B2872 code specifically points to a sensor fault.

5. How do I diagnose the B2872 code?

Use an OBDII scanner capable of reading TPMS codes to identify the faulty sensor. You may also need to check the sensor batteries, wiring, and TPMS module for issues.

6. Can I still drive with the B2872 code active?

Yes, you can drive, but it is not recommended as the TPMS may not alert you to low tire pressure, which could lead to unsafe driving conditions.

7. How do I fix the B2872 code on my Mercury?

Repairs may include replacing the faulty tire pressure sensor, reprogramming the TPMS system, or repairing damaged wiring.

8. How much does it cost to fix the B2872 code?

The cost varies depending on the repair, but replacing a tire pressure sensor typically costs $50-$150 per sensor plus labor.

9. Do I need to reset the TPMS after repairing the B2872 code?

Yes, after replacing or repairing the sensor, the TPMS system must be reset or reprogrammed using a TPMS tool or by following the vehicle's reset procedure.

10. How can I prevent the B2872 code from occurring in the future?

Regularly inspect your tire pressure sensors, replace them when their batteries run low, and avoid physical damage to the sensors during tire changes.