Engine-Codes - Mercury - B0090 Mercury

B0090 Mercury Code - Left Frontal Restraints Sensor 1

- Code Popularity: 2,823 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

What are the Possible Causes of the Code 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 B0090 Mercury Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the Cost to Diagnose the Code B0090 Mercury?

Labor: 1.0

The cost to diagnose the B0090 Mercury code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

Does your Mercury have Safety Recalls? → Check here

What are Code B0090 Mercury Possible Symptoms?

  • Air Bag Warning Light ON

What Does the B0090 Mercury Code Mean?

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.

B0090 Mercury Code - Left Frontal Restraints Sensor 1

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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.