p0171
Moderate
Jaguar · Sedans & Sports Cars
System Too Lean (Bank 1)
Quick Answer
Error code P0171 on your Jaguar Sedans & Sports Cars 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
Check oxygen sensor condition
2
Inspect for vacuum leaks
3
Test fuel injectors
4
Replace fuel filter if clogged
5
Clear diagnostic codes and retest
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
Fuel filter
Gasket set
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