Damaged, corroded or loose connector or wiring on the left side sensor circuit (door hinge wiring loom, pillar or seat connectors); Faulty left side restraints sensor (door pressure sensor, pillar or side impact accelerometer, depending on model); Sensor incorrectly fitted, loose mounting or damage after a previous collision, door repair or trim removal; Poor earth or low supply voltage affecting the restraints module or sensor; Water ingress or corrosion in the door, sill or pillar connectors; Faulty restraints control module.

B0093

Left Side Restraints Sensor 3.

Generic
Body
Generic code
High severity

How this code is built

B: SystemBody
0: Defined bySAE, the same on every car
0: AreaBody area 0
93: FaultThe specific fault in that area

What it means

B0093 is the generic SAE J2012 code for a fault on the Left Side Restraints Sensor 3 circuit or device. The restraints control module (airbag ECU) found a fault with that sensor, such as an implausible signal, a wiring or connector fault, or a missing or incorrect reading. Which physical sensor is 'Sensor 3' (for example a door pressure sensor, side impact accelerometer or pillar sensor) and the exact fault type depend on the make and model, so check the manufacturer data.

Symptoms

Airbag or SRS warning light on
Possible message about a restraint system fault
Left side airbags or pretensioners may be disabled or may not deploy in a crash
Warning light may come and go, especially after a door is slammed or the seat is moved
Other SRS fault codes stored alongside it

Possible causes

Damaged, corroded or loose connector or wiring on the left side sensor circuit (door hinge wiring loom, pillar or seat connectors)likely
Faulty left side restraints sensor (door pressure sensor, pillar or side impact accelerometer, depending on model)likely
Sensor incorrectly fitted, loose mounting or damage after a previous collision, door repair or trim removalpossible
Poor earth or low supply voltage affecting the restraints module or sensorpossible
Water ingress or corrosion in the door, sill or pillar connectorspossible
Faulty restraints control modulerare

How to diagnose

Scan all modules and note B0093 together with any other SRS codes, then read the freeze frame or status data and check whether the fault is current, intermittent or historic
Look up the manufacturer data to confirm which sensor is 'Sensor 3' on this model and what the fault sub-type means
Visually inspect the left side for crash damage, previous repairs, door skin damage or signs of water ingress
Check battery condition and charging voltage, as low voltage can set restraint faults
With the battery disconnected and the manufacturer's waiting time observed, inspect the sensor connectors and the door hinge or pillar wiring for corrosion, bent pins, chafing or poor locking
Check the sensor mounting, orientation and tightness against the manufacturer's specification
Wiggle test the wiring while watching live sensor data for dropouts, following the manufacturer's safe procedure and never probing airbag or pretensioner circuits directly
Measure the circuit resistance and supply using the manufacturer's test procedure, and only then consider the sensor or module

How to fix

Repair or replace damaged wiring or connectors on the left side sensor circuit, using the manufacturer's approved repair method
Replace the faulty left side restraints sensor and make sure it is fitted correctly and torqued as specified
Correct a loose or incorrectly mounted sensor and refit any disturbed trim or door components properly
Repair earth or power supply faults affecting the restraints system
Replace or repair the restraints control module only if testing proves it faulty, then carry out any coding or setup the manufacturer requires
Clear the code after repair and confirm the SRS light stays off and no codes return

Can I keep driving?

High severity

The car will usually still drive, but the left side restraints may not work properly in a crash, so treat it as a safety fault. Have it inspected and repaired as soon as possible and avoid carrying passengers on that side if you can.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.