What is an OBD2 code?

An OBD2 (On-Board Diagnostics) code is a diagnostic trouble code (DTC) generated by your vehicle's computer system when it detects a problem. These codes help identify specific issues with your vehicle's engine, transmission, emissions, or other systems.

How do I read OBD2 codes?

To read OBD2 codes, you'll need an OBD2 scanner. Plug it into your vehicle's OBD2 port (usually located under the dashboard), turn your key to the 'ON' position, and follow your scanner's instructions to retrieve the codes. Each code starts with a letter (P, B, C, or U) followed by four numbers.

What do the different types of OBD2 codes mean?

OBD2 codes are categorized by their first letter: P (Powertrain) for engine and transmission issues, B (Body) for interior systems like airbags, C (Chassis) for mechanical systems like brakes, and U (Network) for computer and module communication problems.

🖨️

Home » OBD2 Codes » B0104

Code B0104

Symptoms

• Airbag warning light on

• Airbags may not deploy in a crash

• Error message on diagnostic tool

Common Causes

• Faulty airbag sensor

• Damaged wiring or connectors

• Faulty airbag control module

Glossary

Airbag Sensor: A device that detects sudden deceleration and sends a signal to deploy airbags.

OBD-II: On-Board Diagnostics, a system for monitoring vehicle performance and emissions.

Related Codes

• B0101

• B0102

Laymans terms

This code means there's a problem with one of the sensors in the car that helps control the airbags. It's like when a toy's battery is low and it doesn't work right.

Explanation

The B0104 code indicates an issue with the right side airbag sensor circuit.

Technical description

B0104 is a diagnostic trouble code (DTC) for a malfunction in the right front airbag sensor circuit. This could mean that the sensor is not sending the right signals to the airbag control module, which can affect airbag deployment.

Diagnosis steps

• Inspect the airbag sensor and its wiring for damage.

• Check the connectors for corrosion or loose connections.

• Use a diagnostic tool to read airbag module data.

Repair procedures

• Replace the faulty airbag sensor.

• Repair or replace damaged wiring or connectors.

• Reset the airbag control module.

Tools required

• OBD-II scanner

• Multimeter

• Screwdriver set

Estimated repair cost

$100 - $300

Difficulty level

Moderate

Commonly affected vehicles

• Toyota Camry

• Honda Accord

• Ford Focus

Preventive measures

• Regularly inspect airbag system components.

• Avoid water exposure to the sensor area.

• Ensure proper maintenance of vehicle electronics.

Error code type

Sensor Issue

User experience recommendations

• Do not ignore the airbag warning light.

• Have a professional inspect the airbag system.

• Avoid tampering with airbag components.

Warranty information

Airbag components may be covered under a vehicle's safety warranty.

Historical data

This code has been associated with sensor failures in older vehicle models.

Urgency level

High – Airbags are critical safety components.

Legal and safety notice

Driving with a faulty airbag system can be dangerous and may violate safety regulations.

Testing conditions

• Vehicle ignition on

• Airbag system self-test in progress

Component location

The right front airbag sensor is typically located near the front bumper or fender.

FAQs

Q: What happens if I ignore this code?
A: Ignoring this code can result in airbags not deploying during a crash, compromising safety.

Q: Can I fix this issue myself?
A: It's recommended to have a professional handle airbag system repairs due to safety concerns.

Last updated: Apr 20, 2026 • Source: internal database

Diagnose Your Check Engine Light