# P0171 on the 2012 Hyundai Sonata

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.

## Bulletins for this model year that name P0171

- [10082724](https://open.wenmarpro.com/bulletins/10082724), 2016-10-18: "THIS BULLETIN PROVIDES INFORMATION RELATED TO THE ENGINE CONTROL MODULE \(ECM\) SOFTWARE UPDATE TO PREVENT AN INCREASE IN THE CATALYST TEMPERATURE WHICH MAY RESULT IN ILLUMINATION OF THE MALFUNCTION INDICATOR LIGHT WITH THE FOLLOWING DTC\(S\): H P0171 \- SYSTEM TOO LEAN \- BANK 1. H P0420 \- CATALYTIC CONVERTER SYSTEM, BANK 1 \- EFFICIENCY BELOW THRESHOLD. IN RARE CASES, THERE CAN BE A REDUCTION IN ENGINE POWER IF THE CATALYST IS RESTRICTED."