OBD Guide
ENFRDEESPT

P1171

Fuel System Lean During Acceleration

P1171 is an OBD-II diagnostic trouble code meaning: Fuel System Lean During Acceleration. Common causes: dirty or faulty air flow sensor, air leaks in the intake tract. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Loss of power when accelerating
  • Jerking or lag during acceleration
  • Increased fuel consumption
  • Unstable engine operation
  • Check Engine Light Is On

Causes

  • Dirty or faulty air flow sensor
  • Air leaks in the intake tract
  • Fuel pump malfunction
  • Clogged fuel injectors
  • Problems with the throttle position sensor

How to Fix

  1. Check the tightness of the intake tract
  2. Clean or replace the mass air flow sensor
  3. Check fuel pressure
  4. Clean or replace fuel injectors
  5. Check the operation of the throttle position sensor

Related codes

P0171P0172P0174

Error P1171 by Vehicle Brand

BuickCadillacChevroletChryslerFordGMGMCJaguarLincolnMercuryOldsmobileSaturnVolkswagen

FAQ

What does the P1171 code mean?

P1171 is an OBD-II diagnostic trouble code that indicates: Fuel System Lean During Acceleration

What causes a P1171 error code?

The most common causes of P1171 include: Dirty or faulty air flow sensor; Air leaks in the intake tract; Fuel pump malfunction; Clogged fuel injectors.

How do I fix a P1171 diagnostic trouble code?

To fix P1171: Check the tightness of the intake tract. Clean or replace the mass air flow sensor. Check fuel pressure. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1171?

Yes, but get it checked soon

How much does it cost to fix P1171?

The estimated repair cost for P1171 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat