AutoCodes – Mercury – B0090 Mercury

B0090 Mercury Code - Left Frontal Restraints Sensor 1

Quick Answer

The Restraints Control Module (RCM) monitors all of Supplemental Restraint System (SRS) device connections. Common causes include Faulty Left Frontal Restraints Sensor, Left Frontal Restraints Sensor harness is open or shorted, Left Frontal Restraints 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: B0090 Mercury indicates Left Frontal Restraints Sensor 1.
Common causes: Common causes include Faulty Left Frontal Restraints Sensor, Left Frontal Restraints Sensor harness is open or shorted, Left Frontal Restraints 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 3,295

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0090 Mercury Description

The Restraints Control Module (RCM) monitors all of Supplemental Restraint System (SRS) device connections. If the RCM detects a connection or device connected that is not stored in memory or is not configured for the component, the RCM will set a Diagnostic Trouble Code (DTC) and send a message to the Instrument Panel Cluster (IPC) to illuminate air bag warning indicator.

OBDII Code B0090 Mercury - Left Frontal Restraints Sensor 1 - AutoCodes.com — B0090 Mercury Code - Left Frontal Restraints Sensor 1

What does this mean?

What are the Possible Causes of the DTC B0090 Mercury?

Faulty Left Frontal Restraints Sensor
Left Frontal Restraints Sensor harness is open or shorted
Left Frontal Restraints Sensor circuit poor electrical connection

How to Fix the DTC B0090 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 B0090 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 B0090 Mercury code?

Need more information on how to fix the B0090 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0090 Mercury code diagnosed by a professional: Find a repair shop in your area

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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 B0090 Mercury Code

1. What are the common symptoms of OBDII code B0090 in a Mercury related to the Left Frontal Restraints Sensor 1?

The common symptoms include the airbag warning light illuminating on the dashboard and potential issues with the airbag system's functionality.

2. What are the possible causes of OBDII code B0090 in a Mercury indicating a problem with the Left Frontal Restraints Sensor 1?

Common causes of this code can be a malfunctioning frontal sensor, wiring issues, a faulty airbag control module, or impact damage to the sensor.

3. How can I diagnose the OBDII code B0090 in a Mercury specifically related to the Left Frontal Restraints Sensor 1?

Diagnosis typically involves using a scan tool to retrieve the specific fault code, inspecting the sensor and its wiring for any visible damage, and conducting further electrical testing if needed.

4. What are some repair tips for fixing OBDII code B0090 in a Mercury associated with the Left Frontal Restraints Sensor 1?

Repair tips may include checking and repairing any damaged wiring, replacing the Left Frontal Restraints Sensor 1 if necessary, and resetting the airbag system after repairs are completed.

5. Is it safe to drive a Mercury with the OBDII code B0090 related to the Left Frontal Restraints Sensor 1?

It is not recommended to drive the vehicle with an active airbag fault code, as it may compromise the effectiveness of the airbag system in the event of an accident.

6. How much does it typically cost to repair OBDII code B0090 in a Mercury linked to the Left Frontal Restraints Sensor 1?

The cost of repairs can vary depending on the specific issue causing the fault code, but it may range from a few hundred dollars to over a thousand dollars, including parts and labor.

7. Can I reset the OBDII code B0090 in a Mercury related to the Left Frontal Restraints Sensor 1 on my own?

While you can attempt to clear the code with a scan tool, it is important to diagnose and fix the underlying issue causing the fault code to ensure the safety and functionality of the airbag system.

8. How long does it typically take to repair OBDII code B0090 in a Mercury associated with the Left Frontal Restraints Sensor 1?

The repair time can vary based on the complexity of the issue, but it may take a few hours to a full day to diagnose, repair, and reset the fault code.

9. Are there any recalls or technical service bulletins related to OBDII code B0090 in a Mercury regarding the Left Frontal Restraints Sensor 1?

It is advisable to check with your local Mercury dealership or online resources for any relevant recalls or technical service bulletins related to this specific fault code to see if your vehicle may be covered under any existing programs.

10. Will ignoring the OBDII code B0090 in a Mercury related to the Left Frontal Restraints Sensor 1 cause further damage to the vehicle?

Ignoring the fault code can potentially lead to safety risks in the event of a collision, as the airbag system may not deploy correctly. It is recommended to address the issue promptly to ensure the proper functioning of the safety systems in your vehicle.