One problem related to o2 sensor has been reported for the 2017 Ford Fiesta. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2017 Ford Fiesta based on all problems reported for the 2017 Fiesta.
The car evap purge valve stays open. The car idles and dies everytime I put gas in. The purge valve was replaced less than a year of purchasing the car and it's gone bad again. The check engine light and engine malfunction warning came on then two days later the car died after I added gas and took 2 hours to start. I bought a new battery and drove it another week. It still idles after adding fuel even with the new battery. It finally died and I had it towed to the Ford dealer and they did a diagnostic and said the catalytic converter, throttle body and evao purge valve, O2 sensor is bad and all 3 needs replacing.
| Electrical System problems | |
| O2 Sensor problems |