B0102 on Toyota: How to Diagnose & Fix
Electronic Side Sensor Malfunction
1 Toyota model · 1 documented issue · 1 critical
B0102 on Toyota by model: symptoms, diagnosis and fix
Takata airbag inflators can explode during deployment, sending metal shrapnel at occupants. This is a critical safety recall affecting millions of vehicles. On the 2010-2016 4Runner, the front passenger airbag inflator needs replacement (NHTSA recall 19V-005; the model years covered depend on the state where the vehicle is registered). Multiple deaths and injuries have been linked to this defect.
Common Symptoms
- Recall notice received
- Airbag warning light (unrelated symptom)
- No symptoms - defect is hidden
How to Fix
Check VIN immediately at NHTSA.gov, SaferCar.gov, or Toyota's recall website. Repairs are free at any Toyota dealer. Do not delay - this is a life-threatening defect. If parts are unavailable, Toyota may provide a loaner vehicle. This recall never expires.
Owner tips & cautions
- WarningThis is a high-severity issue - ignoring it can lead to costly repairs or safety concerns. Address it promptly.
- TipGet a proper diagnosis before replacing parts - similar symptoms can have different causes
- TipSearch Toyota 4Runner forums and owner groups for real-world experiences and DIY guides
- TipGet multiple quotes from independent mechanics - dealer prices can be 2-3x higher for the same repair
- TipCheck NHTSA.gov for active recalls — repairs are performed free at authorized dealers
Sources for this issue (5)
- NHTSA Recall 19V-005: Toyota passenger frontal air bag inflators (incl. 2010-2016 4Runner)government
- Toyota Pressroom: Toyota is conducting final phase of Takata airbag safety recallmanufacturer
- Toyota: Look up Safety Recalls & Service Campaigns by VIN (Takata)manufacturer
- Consumer Reports: Toyota Recall to Replace Airbags Again | Takatamedia
- Toyota 4Runner Forum: Takata Airbag Recallforum
B0102 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does B0102 mean on a Toyota?
B0102 stands for "Electronic Side Sensor Malfunction." This body/safety code indicates a malfunction with an electronic crash sensor used by the airbag (SRS) system, typically a frontal or side impact sensor on one side of the vehicle. The airbag control module continuously checks these sensors so it can deploy airbags and tensioners correctly in a crash, and it sets this code when a sensor reports an incorrect identity, fails, or its circuit is faulty. The airbag warning light will usually be on. Because it can compromise crash protection, it should be diagnosed promptly. On Toyota it is documented across 1 model: 4Runner.
What are the most common causes of B0102?
The most common causes of B0102 are: Faulty electronic side/frontal impact sensor, Open, shorted, or damaged sensor wiring harness, Corroded or loose sensor connector, Wrong or incompatible replacement sensor installed, Damage from a prior collision or water intrusion, Poor ground or connection in the SRS circuit, Faulty airbag control module (less common). The specific cause varies by vehicle.
How much does it cost to fix B0102 on a Toyota?
Repair costs vary widely with the root cause and Toyota model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.