/live/media/NP/NP_2344939_Fro.jpg)
Denso 234-4939 Oxygen Sensor - Downstream
| Brand | Denso 234-4939 |
|---|---|
| Position | Downstream |
| Wiring Harness Length | 26.77 |
| Sensor Type | Heated |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Product line | Oxygen Sensor - OE Style |
| Fits | Mazda · 25 vehicles |
OE style. Precision-built for exact replacement and a first-time fit.
Heated sensor. Helps the oxygen sensor reach operating temperature quickly.
Aluminum oxide trap layer. Protects the ceramic element from silicone and lead contamination.
Cross-references Mazda PE121886Z, NTK 24792 and Walker Products 250-241074 for the same application. See all 4.
Denso OE Style Oxygen Sensor 234-4939
Denso 234-4939 is an OE-style heated oxygen sensor built for direct replacement on select Mazda applications. It is engineered for exact fitment and stable signal performance, with coverage for downstream locations on Mazda 3, Mazda 3 Sport, and Mazda 6 models.
Key Features
- Heated oxygen sensor for downstream exhaust monitoring
- Specific-fit design for direct replacement installation
- 4-wire configuration for the listed applications
- 26.77 in. wiring harness length
- OE-style construction for Mazda 6, Mazda 3, and Mazda 3 Sport fitment
OE-Style Design and Construction
Denso’s OE Style line is built and tested to OE-level standards, with precision manufacturing aimed at first-time fit and consistent operation. This oxygen sensor uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting reliable exhaust feedback and long service life. This part number, 234-4939, is a direct-fit replacement for downstream sensor locations on select Mazda vehicles.
This part cross-references Mazda PE121886Z and NTK 24792 for the same application.
Vehicle Fitment
- Fits 2020-2021 Mazda 6, downstream. OE; Oxygen Sensor - OE Style.
- Fits 2014-2019 Mazda 6, downstream. OE Style.
- Fits 2018 Mazda 3, downstream. Fits Japan built vehicles; OE Style.
- Fits 2017-2018 Mazda 3 Sport, downstream. Fits Japan built vehicles; OE Style.
- Fits 2014-2017 Mazda 3, downstream. OE Style.
- Fits 2014-2016 Mazda 3 Sport, downstream. OE Style.
What This Sensor Helps Address
- Check engine light related to downstream oxygen sensor faults
- Incorrect exhaust oxygen readings affecting fuel control
- Reduced fuel economy caused by a failing sensor
- Slow or unstable sensor response in the exhaust system
- Replacement needs for worn or contaminated OE-style sensors
Installation Notes and Tips
Confirm the downstream sensor location before installation and match the connector and wire count to the original part. Verify vehicle build details for 2018 Mazda 3 and 2017-2018 Mazda 3 Sport applications, since the listing specifies Japan-built vehicles. Use the existing harness routing and secure the lead away from hot exhaust components.
Quality Assurance
Denso manufactures and tests this oxygen sensor to OE standards for fit, function, and durability. The OE-style design is intended to deliver the correct part and fit for the listed Mazda applications, including Mazda 6, Mazda 3, and Mazda 3 Sport models.
| Year | Make | Model | Submodel | Position | Notes |
|---|---|---|---|---|---|
| 2021 | Mazda | 6 | — | Downstream | OE; Oxygen Sensor - OE Style |
| 2020 | Mazda | 6 | — | Downstream | OE; Oxygen Sensor - OE Style |
| 2019 | Mazda | 6 | — | Downstream | OE Style |
| 2018 | Mazda | 3 | Touring | Downstream | Fits Japan built vehicles; OE Style |
| 2018 | Mazda | 3 | Grand Touring | Downstream | Fits Japan built vehicles; OE Style |
| 2018 | Mazda | 3 | GT | Downstream | Fits Japan built vehicles; OE Style |
| 2018 | Mazda | 3 | Sport | Downstream | Fits Japan built vehicles; OE Style |
| 2018 | Mazda | 3 | SE | Downstream | Fits Japan built vehicles; OE Style |
| 2018 | Mazda | 3 | GX | Downstream | Fits Japan built vehicles; OE Style |
| 2018 | Mazda | 3 | GS | Downstream | Fits Japan built vehicles; OE Style |
| 2018 | Mazda | 3 | G | Downstream | Fits Japan built vehicles; OE Style |
| 2018 | Mazda | 3 Sport | — | Downstream | Fits Japan built vehicles; OE Style |
| 2018 | Mazda | 6 | — | Downstream | OE Style |
| 2017 | Mazda | 3 | — | Downstream | OE Style |
| 2017 | Mazda | 3 Sport | — | Downstream | Fits Japan built vehicles; OE Style |
| 2017 | Mazda | 6 | — | Downstream | OE Style |
| 2016 | Mazda | 3 | — | Downstream | OE Style |
| 2016 | Mazda | 3 Sport | — | Downstream | OE Style |
| 2016 | Mazda | 6 | — | Downstream | OE Style |
| 2015 | Mazda | 3 | — | Downstream | OE Style |
| 2015 | Mazda | 3 Sport | — | Downstream | OE Style |
| 2015 | Mazda | 6 | — | Downstream | OE Style |
| 2014 | Mazda | 3 | — | Downstream | OE Style |
| 2014 | Mazda | 3 Sport | — | Downstream | OE Style |
| 2014 | Mazda | 6 | — | Downstream | OE Style |
| No rows match your filter. | |||||