← View Generic B0904 Guide
Severity: High
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Vehicle-Specific Guide
This guide is customized for your 2018 BMW X5
B0904: B0904: Airbag System Fault
on 2018 BMW X5
Fix Cost
$500 - $1500
Parts & Labor
Difficulty
4/5
2-4 hours
DIY Possible?
❌ No
Pro recommended
Your Vehicle
2018 BMW
X5
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Important for 2018 BMW X5 Owners
Before starting repairs, verify which engine your 2018 BMW X5 has. Check your VIN or engine code to ensure you order the correct parts.
📖 What Does B0904 Mean on 2018 BMW X5?
The airbag system has detected a fault, which may be caused by a malfunctioning sensor, wiring issue, or faulty airbag module.
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Symptoms
- • Airbag warning light on dashboard
- • unusual airbag deployment
- • or no airbag deployment in a crash
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Common Causes
- • Faulty airbag sensor
- • wiring damage
- • airbag module failure
- • or ECU software issue
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How to Fix B0904 on 2018 BMW X5
1. Check airbag sensor connections and wiring for damage. 2. Clear any error codes and test the airbag system. 3. Replace faulty airbag sensor or module if necessary. 4. Update ECU software if required.
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Need Maintenance Info for Your X5?
Get oil capacity, filter specs, and torque settings for your specific 2018 BMW X5.
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Related Diagnostic Codes
Other codes that may appear with B0904
B0902
Sequential Code
B0902: Immobilizer System Malfunction
High
B0903
Sequential Code
B0903: Audio System Malfunction
Medium
B0905
Sequential Code
B0905: Climate Control Fan Motor Malfunction
Medium
B0906
Sequential Code
B0906: Door Locks Malfunction
Medium
💡 Why These Codes Are Related:
- • Similar Issues: Same root cause or component failure
- • Related Problems: Often occur together due to system interactions
- • Sequential Codes: Progressive failure stages or multiple sensors
- • Same System: Components within the same automotive system