p0171
Moderate
RAM · Trucks
System Too Lean Bank 1
Quick Answer
Error code P0171 on your RAM Trucks 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 OBD-II scanner and verify code
2
Inspect for vacuum leaks using smoke test or visual inspection
3
Test oxygen sensor voltage with multimeter
4
Check fuel pressure at rail (should be 50-60 psi)
5
Replace faulty component as identified
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
Fuel injector
Fuel pump assembly
Vacuum hose kit
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