Delphi ES20422 Oxygen Sensor - Rear

Rear Oxygen Sensor for Mazda MX-5 Miata

Restore accurate exhaust feedback with this Delphi heated oxygen sensor for the rear position. Built with Delphi’s OE experience and supplier knowledge, the ES20422 is a direct-fit replacement for select Mazda MX-5 Miata models and supports precise air-fuel monitoring after the catalytic converter.

• Heated oxygen sensor for rear placement
• 4-wire design with square connector shape
• Thread size: 18 x 1.5 mm
• Overall length: 475.0
• Includes oxygen sensor and instruction sheet
• Fits 2006-2015 Mazda MX-5 Miata, rear

OE-Style Sensor Construction

The Delphi ES20422 oxygen sensor is built for the rear exhaust location on 2006-2015 Mazda MX-5 Miata applications. Its heated design helps the sensor reach operating temperature quickly, while the 4-wire configuration and square connector support a straightforward replacement on the correct rear position. This part cross-references Bosch 15786 and DENSO Auto Parts 234-4340 for the same application.

Common Issues This Sensor Can Address

• Check engine light related to rear oxygen sensor performance
• Incorrect exhaust feedback after the catalytic converter
• Rough idle or drivability concerns tied to sensor signal errors
• Failed emissions inspection caused by a faulty rear O2 sensor
• Reduced fuel control accuracy from aging sensor response

Installation Notes

Verify the rear position, thread size, connector shape, and wire count before installation. The ES20422 is specified for the rear location on Mazda MX-5 Miata models from 2006 through 2015. Follow the included instruction sheet and confirm the connector routing matches the original sensor before final tightening.

Quality Assurance

Delphi draws on more than 100 years of OE experience and supplier knowledge used by major automakers, bringing that heritage into aftermarket replacement parts like the ES20422.