B0101 on Toyota
Electronic Frontal Sensor 2 Malfunction
B0101 on Toyota vehicles indicates electronic frontal sensor 2 malfunction. Au7o has documented this code across 2 Toyota models — most commonly on 4Runner, RAV4. This is a safety-system (SRS/airbag) code, so it should be taken seriously. Modern cars use frontal impact sensors that detect a crash and tell the airbag control module when and how to deploy the airbags. B0101 indicates the airbag (SRS) control module detected a malfunction or circuit fault with frontal impact sensor 2 — meaning the sensor or its wiring isn't reporting correctly, so the module may not be able to rely on it in a collision. This typically lights the airbag warning lamp and can disable airbag deployment until repaired, which is a genuine safety risk in a frontal crash. Note this is a manufacturer-specific code, so the exact sensor location and meaning can vary by make.
Common Causes of B0101
- •Failed front impact/frontal crash sensor (sensor 2)
- •Damaged, corroded or unplugged sensor wiring/connector
- •Connector or wiring damage from a prior collision or repair
- •Water intrusion or corrosion at the sensor connector
- •Poor ground or open circuit to the sensor
- •Faulty airbag (SRS) control module
- •Sensor not properly seated or improperly mounted after service
B0101 on Toyota by Model
Toyota 4Runner(1 issue)
- Takata Airbag Recall2010-2016
Takata airbag inflators can explode during deployment, sending metal shrapnel at occupants. This is a critical safety recall affecting millions of vehicles. The driver and/or passenger airbag inflators need replacement. Multiple deaths and injuries have been linked to this defect.
Toyota RAV4(1 issue)
- Occupant Classification Sensor Short Circuit / Airbag Non-Deployment2020-2022
The Occupant Classification System (OCS) sensor in the front passenger seat may have been improperly manufactured, causing a short circuit. This can prevent the front passenger airbag from deploying in a crash when it should. Part of a 1.12 million vehicle recall.
Looking for B0101 on a different make?
View B0101 across all makes →Frequently Asked Questions
What does B0101 mean on Toyota?▼
B0101 stands for "Electronic Frontal Sensor 2 Malfunction." This is a safety-system (SRS/airbag) code, so it should be taken seriously. Modern cars use frontal impact sensors that detect a crash and tell the airbag control module when and how to deploy the airbags. B0101 indicates the airbag (SRS) control module detected a malfunction or circuit fault with frontal impact sensor 2 — meaning the sensor or its wiring isn't reporting correctly, so the module may not be able to rely on it in a collision. This typically lights the airbag warning lamp and can disable airbag deployment until repaired, which is a genuine safety risk in a frontal crash. Note this is a manufacturer-specific code, so the exact sensor location and meaning can vary by make. On Toyota specifically, this code is documented across 2 models.
What causes B0101 on Toyota vehicles?▼
Common causes on Toyota: Failed front impact/frontal crash sensor (sensor 2), Damaged, corroded or unplugged sensor wiring/connector, Connector or wiring damage from a prior collision or repair, Water intrusion or corrosion at the sensor connector, Poor ground or open circuit to the sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B0101 on a Toyota?▼
Repair costs vary widely depending on the root cause and specific Toyota model.
Which Toyota models have B0101 documented?▼
Au7o has documented B0101 on 2 Toyota models: 4Runner, RAV4.