A-Premium Downstream Oxygen Sensor for Hyundai & Kia — Bank 1 Sensor 2, Heated 4-Wire Direct-Fit

The A-Premium downstream oxygen sensor (Bank 1, Sensor 2) replaces your vehicle’s downstream O2 sensor to restore accurate exhaust monitoring and emissions control on compatible Hyundai and Kia models.

This direct-fit heated oxygen sensor is designed for downstream placement (Bank 1, Sensor 2) and matches OE electrical and mounting interfaces for a reliable plug-and-play replacement on specified Hyundai and Kia vehicles. It is built with a threaded mounting, a four-wire heated design, and a male connector for simple installation. Confirming vehicle, bank and sensor position plus emissions standard (Federal vs California) before ordering helps avoid incompatibility.

Which vehicles and engine types work with this A-Premium oxygen sensor?

This sensor fits a range of Hyundai and Kia models from the early 2010s to late 2010s when the vehicle uses a downstream Bank 1, Sensor 2 arrangement. Fitment covers certain Federal emissions models and specific engine sizes; it is not a universal sensor.

• Kia: Forte (2014–2018), Forte Koup (2014–2017), Forte5 (2014–2018), Rondo (2014–2016) — L4 2.0L engines per listing details.
• Hyundai: Elantra (2011–2013 1.8L; 2013 Coupe 1.8L), Elantra GT (2013 1.8L; 2014–2017 2.0L), Tucson (2016–2018 AWD 2.0L).
• Not compatible when your vehicle requires Bank 1 Sensor 1 or California emissions-specific parts unless otherwise noted.

How does this downstream sensor differ from an upstream sensor?

Downstream oxygen sensors sit after the catalytic converter and monitor converter efficiency rather than controlling fuel trim. They typically experience different temperature and exhaust conditions, so downstream sensors use designs tuned for stable long-term readings.

• Function: Monitors catalyst performance, not primary fuel mixture adjustments.
• Location: Installed post-catalytic converter (Bank 1, Sensor 2 specifically).
• Design: Heated, four-wire construction for faster warm-up and stable signal.
• Mounting: Threaded for OE-style fitment and gasket sealing.

What should I check before ordering to ensure proper fit?

Verify the exact bank and sensor number, your vehicle’s model year and engine code, and whether your car follows Federal or California emissions standards. Using the vehicle selector and cross-reference numbers helps you avoid returns.

• Confirm position: must be Bank 1, Sensor 2 (downstream); this unit will not replace Sensor 1.
• Emissions: many fits apply only to Federal emissions vehicles; California-spec cars may need a different part.
• Reference numbers: 250-24987, 234-4550, 25024987, 2344550, 18103, 25733, 392102E500 for cross-checking.
• Connector and wires: four-wire heated type with male connector — match to your vehicle harness.

What are the technical specifications and installation notes?

The sensor ships in boxed packaging and includes one threaded heated oxygen sensor with a four-conductor lead and male connector. Basic hand tools and an oxygen sensor socket facilitate replacement; anti-seize is sometimes applied to threads, but check the product or vehicle service manual first.

• Wire quantity: 4 (heated sensor design for rapid warm-up).
• Mounting: threaded OE-style; connector gender: male.
• Packaging: single sensor per box for direct replacement.
• Installation tip: verify wiring routing and torque to manufacturer specs to avoid damage.

Who is this for: This A-Premium downstream oxygen sensor is intended for Hyundai and Kia owners, DIY mechanics, and professional technicians who need a cost-effective, direct-fit replacement for Bank 1 Sensor 2 on compatible models. If your vehicle requires upstream sensors, or is California-emissions specific where noted, select the appropriately designated part instead. Always confirm fitment using your vehicle’s year, engine, emissions spec, and the sensor position before purchasing.