HYUNDAI
26-FL-003H TSB
Manufacturer communications
- Publication date
- 2026-07-01
- Received by NHTSA
- 2026-07-08
- NHTSA record numbers
- 11034847
Manufacturer summary
Original wording in English
Some Kona (SX2) vehicles equipped with the 1.6L T‐GDI engine may exhibit false “engine left idling” notifications in the MyHyundai app, even when the engine is not running, due to a logic error associated with the front oxygen (O2) sensor. This condition may also illuminate the Malfunction Indicator Lamp (MIL) and set DTC P223700 (O2 Sensor Pumping Current Circuit/Open [Bank 1 Sensor 1]). This bulletin provides instructions to perform an ECU software update to correct the O2 sensor logic and resolve the condition.
Reported code forms
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
Hyundai
P223700O2 Sensor Pumping Current Circuit/Open [Bank 1 Sensor 1]Check vehicle applicability
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.