← View Generic P0404 Guide
Severity: Medium
🚗
Vehicle-Specific Guide
This guide is customized for your 2018 BMW X5
P0404: Exhaust Gas Recirculation Circuit Range/Performance
on 2018 BMW X5
Fix Cost
$50 - $350
Parts & Labor
Difficulty
3/5
1-3 hours
DIY Possible?
✅ Yes
Save money
Your Vehicle
2018 BMW
X5
⚠️
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 P0404 Mean on 2018 BMW X5?
The EGR valve position does not match what the engine control module expects based on operating conditions.
⚠️
Symptoms
- • Rough idle
- • poor performance
- • failed emissions test
- • check engine light
- • hesitation during acceleration.
🔍
Common Causes
- • Faulty EGR valve position sensor
- • carbon buildup on EGR valve
- • wiring issues to EGR system
- • mechanical problems with EGR valve.
🛠️
How to Fix P0404 on 2018 BMW X5
Replace EGR valve position sensor, clean EGR valve and passages, repair wiring, replace EGR valve if mechanically faulty.
🔧
Need Maintenance Info for Your X5?
Get oil capacity, filter specs, and torque settings for your specific 2018 BMW X5.
View 2018 BMW X5 SpecsParts for 2018 BMW X5
Essential Tool
🔗
Related Diagnostic Codes
Other codes that may appear with P0404
P0402
Sequential Code
Exhaust Gas Recirculation Flow Excessive Detected
Medium
P0403
Sequential Code
P0403: Emissions Control System Not Operating Within Normal Parameters
Medium
P0405
Sequential Code
P0405: Emissions Control System Not Operating Within Normal Parameters
Medium
P0406
Sequential Code
P0406: Emissions Control System Not Operating Within Normal Parameters
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