Fuel SystemHigh ImpactPetrol
P0171 — System Too Lean (Bank 1)
The fuel trim has reached its correction limit trying to compensate for a lean condition. The long-term fuel trim exceeds the normal adaptation range.
7+
Affected Brands
12+
ECU Platforms
4
Related Services
3
Related DTCs
Symptoms
What the driver typically experiences when P0171 is stored
!Check Engine Light
iHesitation under acceleration
iRough idle
iPotential misfires at high load
!!Risk of engine damage if prolonged under boost
Why does P0171 appear after tuning?
Can occur after Stage 2+ tuning if fueling maps are not properly adjusted for increased airflow. Also seen with modified intake systems.
How proper calibration can address P0171
WEREMAP Stage 2 and 3 files include recalibrated fuel maps that account for increased airflow and modified boost targets.
Related Diagnostic Codes
Codes from the same diagnostic system as P0171
Affected ECU Platforms
Delco E78Bosch ME17.9.64Siemens/Continental GPEC4Denso 89663Delco E80Bosch MED17.5.2Valeo vd46Bosch MEVD17.2.G MEVD MEVD17.2.GSiemens/Continental SIM271KE2.0Bosch MED17.5Bosch MED17.2.2 MED17.0.1Bosch MEVD17
Commonly Affected Vehicles
SuzukiJimnyBosch ME17.9.64
JeepRenegadeSiemens/Continental GPEC4
ToyotaTACOMADenso 89663
ChevroletCamaroDelco E80
AudiA3 / A3 BerlineBosch MED17.5.2
Peugeot308Valeo vd46
BMW3 Serie - SedanBosch MEVD17.2.G MEVD MEVD17.2.G
AudiA4Bosch MED17.5
Based on data from 7+ vehicle brands. P0171 is not limited to these models.
Frequently Asked Questions
What does P0171 mean?â–¼
The fuel trim has reached its correction limit trying to compensate for a lean condition. The long-term fuel trim exceeds the normal adaptation range.
Why does P0171 appear after ECU tuning?â–¼
Can occur after Stage 2+ tuning if fueling maps are not properly adjusted for increased airflow. Also seen with modified intake systems.
How do you prevent P0171 during remapping?â–¼
WEREMAP Stage 2 and 3 files include recalibrated fuel maps that account for increased airflow and modified boost targets.
Which vehicles are affected by P0171?â–¼
P0171 is commonly found on Suzuki, Jeep, Toyota, Chevrolet, Audi, Peugeot vehicles equipped with Delco E78, Bosch ME17.9.64, Siemens/Continental GPEC4, Denso 89663 ECU platforms.
What other codes appear alongside P0171?â–¼
P0171 frequently appears together with P0174, P0172, P2271. These related codes typically originate from the same system modification and should be addressed together in the calibration.
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