MasterTuning Fault code dictionary (DTC)

P0171 — System too lean

Severity: Attenzione Can you drive? Sì, no known limitation Produttore: Tutti makes (OBD-II standard)
MeaningMore air (oppure less fuel) is entering the Motore than expected. On Benzina Motori it is almost always an unwanted air leak.
FamilyPowertrain (P)

Typical symptoms

Rough idle
Hesitation under acceleration
Motore Attenzione light on
Slower starting

Common causes

Cracked intake pipe oppure leaking gasket
Faulty PCV valve oppure breather
Dirty injectors
Weak fuel pump oppure blocked Filtra
Aged lambda sensor

What a do

Find the leak with a smoke test: it is the quickest method and solves most cases. Replacing the lambda sensor before ruling out leaks is often wasted money.

Domande Frequenti

What does code P0171 mean?

System too lean. More air (oppure less fuel) is entering the Motore than expected. On Benzina Motori it is almost always an unwanted air leak.

Can I keep driving with code P0171 Attivo?

Sì, no known limitation

Common causes — P0171

Cracked intake pipe oppure leaking gasket Faulty PCV valve or breather Dirty injectors Weak fuel pump or blocked Filtra Aged lambda sensor

How do you fix code P0171?

Find the leak with a smoke test: it is the quickest method and solves most cases. Replacing the lambda sensor before ruling out leaks is often wasted money.

Need Aiuto with this fault?

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