P1171
Fuel System Lean During Acceleration
Severity
⚠️ MediumCan 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
- Check the tightness of the intake tract
- Clean or replace the mass air flow sensor
- Check fuel pressure
- Clean or replace fuel injectors
- Check the operation of the throttle position sensor