P0171 on the 2016 Fiat 500
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| 18-030-15 | 2018-12-10. Service bulletin. Flash: Powertrain Diagnostic And System Enhancements This bulletin involves reprogramming the Engine Control Module (ECM) with the latest available software. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes (DTCs). ? P0171 - Fuel System 1/1 Lean ? P050D - Cold Start Rough Idle |
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| 18-030-15 REVA | 2018-12-03. Service bulletin. Flash: Powertrain Diagnostic And System Enhancements This bulletin involves reprogramming the Engine Control Module (ECM) with the latest available software. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes (DTCs). ? U0402 - implausible data received from TCM ? P0133 - O2 sensor 1/1 slow response ? P0171 - Fuel System 1/1 Lean ? P050D - Cold Start Rough Idle In addition, customers may experience one or more of the following concerns: ? RPM flare at cold start. ? Less than desired idle performance. ? Cold engine RPM surge with gear engagement. |
| 18-030-15 REV-B | 2018-11-19. Service bulletin. Flash: Powertrain Diagnostic And System Enhancements This bulletin involves reprogramming the Engine Control Module (ECM) with the latest available software. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes (DTCs). ? U0402 - Implausible Data Received From TCM. ? P0133 - O2 Sensor 1/1 Slow Response. ? P0171 - Fuel System 1/1 Lean. ? P050D - Cold Start Rough Idle. In addition, customers may experience one or more of the following concerns: ? Clatter or ticking noise from the engine at idle. ? RPM flare at cold start. ? Less than desired idle performance. ? Cold engine RPM surge with gear engagement. |
3 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.