p0174
Moderate
Buick · SUVs
System Too Lean (Bank 2)
Quick Answer
Error code P0174 on your Buick SUVs means: System Too Lean (Bank 2). This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Retrieve and document the DTC with OBD-II scanner
2
Perform visual inspection of intake system
3
Measure fuel pressure under load
4
Test oxygen sensor operation
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Fuel pump relay
Oxygen sensor
Fuel pressure gauge
Related Error Codes