p0171
Moderate
Opel · Sedans & Hatchbacks
System Too Lean (Bank 1)
Quick Answer
Error code P0171 on your Opel Sedans & Hatchbacks means: System Too Lean (Bank 1). This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Connect diagnostic scanner and read the error code
2
Inspect oxygen sensor connectors for damage
3
Check fuel pressure with gauge (should be 45-50 psi)
4
Scan for vacuum leaks using smoke test
5
Replace faulty component as needed
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
Oxygen sensor (if faulty)
Fuel injector (if faulty)
Vacuum hose (if damaged)
Related Error Codes