This guide is customized for your 2018 BMW X5
P0173: P0173: Fuel Trim Malfunction (Bank 1)
on 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 P0173 Mean on 2018 BMW X5?
Symptoms
- • Rough idle
- • decreased power
- • poor fuel economy
- • and a check engine light
Common Causes
- • Vacuum leak
- • faulty oxygen sensor
- • clogged fuel filter
- • dirty or clogged fuel injectors
- • faulty fuel pressure regulator
- • or a malfunctioning fuel pump
How to Fix P0173 on 2018 BMW X5
1. Check for vacuum leaks and repair as necessary. 2. Replace the oxygen sensor if faulty. 3. Clean or replace the fuel filter. 4. Check and clean fuel injectors. 5. Check fuel pressure and replace the fuel pressure regulator if necessary. 6. Check the fuel pump and replace if necessary.
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 P0173
System Too Lean Bank 1
System Too Rich Bank 1
System Too Lean Bank 2
System Too Rich Bank 2
💡 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