All codes
P0174Fuel System
System Too Lean Bank 2 - Causes & Solutions
Fix P0174 lean condition on Bank 2. Often appears with P0171. Learn the common causes and effective repair strategies.
What you may notice
Symptoms
- 01Check engine light on
- 02Rough idle
- 03Hesitation under acceleration
- 04Poor fuel economy
- 05May appear with P0171
Where to look first
Common causes
- 01Vacuum leak on Bank 2 side
- 02Low fuel pressure (affects both banks)
- 03MAF sensor contamination
- 04Faulty Bank 2 oxygen sensor
- 05Intake manifold gasket leak
Step by step
What to check and repair
- 01If with P0171, focus on common causes first
- 02Check for vacuum leaks on Bank 2
- 03Test fuel pressure
- 04Clean or replace MAF sensor
- 05Inspect intake manifold gaskets
What Does P0174 Mean?
The P0174 code indicates a lean fuel mixture on Bank 2 of your engine. This code is only possible on V-type or boxer engines that have two cylinder banks.
P0174 with P0171
If you have both P0171 and P0174, it indicates a lean condition affecting both banks. This usually points to a common cause like: - Low fuel pressure - Large vacuum leak - MAF sensor issues
Bank 2 Location
Bank 2 is the side of the engine that does NOT contain cylinder 1. The exact location varies by manufacturer.