p0171
Moderate
Jeep · SUVs
System Too Lean (Bank 1)
Quick Answer
Error code P0171 on your Jeep SUVs 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 to diagnose fault codes
2
Inspect oxygen sensor for damage or carbon buildup
3
Check fuel pressure using fuel pressure gauge
4
Scan for and inspect vacuum hoses for leaks
5
Clear codes and test drive to verify repair
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 cleaner
Vacuum hoses
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