← View Generic C0491 Guide
Severity: Medium
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Vehicle-Specific Guide
This guide is customized for your 2018 BMW X5
C0491: C0491: Brake System Pressure Sensor Circuit Malfunction
on 2018 BMW X5
Fix Cost
$100 - $500
Parts & Labor
Difficulty
3/5
1-2 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 C0491 Mean on 2018 BMW X5?
The brake system pressure sensor circuit has malfunctioned, indicating a problem with the brake system's hydraulic pressure.
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Symptoms
- • Spongy brake pedal
- • low brake fluid level
- • unusual brake noise
- • or brake light illuminated on dashboard
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Common Causes
- • Faulty brake pressure sensor
- • air in brake system
- • brake fluid leak
- • or clogged brake lines
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How to Fix C0491 on 2018 BMW X5
1. Check brake fluid level and top off if necessary. 2. Bleed brake system to remove air. 3. Replace faulty brake pressure sensor. 4. Inspect brake lines for leaks or damage and repair/replace as needed.
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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 C0491
C0489
Sequential Code
C0489: Wheel Speed Sensor Malfunction
Medium
C0490
Sequential Code
C0490: ABS System Malfunction
Medium
C0492
Sequential Code
C0492: Rear Suspension Strut or Shock Absorber Fault
Medium
C0493
Sequential Code
C0493: Steering Column Position Sensor Circuit 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