Engine and Transmission

Delphi Switching Oxygen Sensors

Delphi Switching Oxygen Sensors with planar element technology provide stoichiometric measurement of exhaust gases for gasoline and alternative fuel engine applications to help manufacturers meet current and future emissions standards.

Delphi Switching Oxygen Sensors include a pumped air reference feature to prevent air reference contamination. They can be used in the engine-out position and in a post-converter location for more accurate engine control and for better exhaust system diagnostics.


  • Fast light-off time with a low-wattage heater can help reduce system costs, help reduce cold-start emissions, and help eliminate the need for other emissions devices.
  • Pumped air reference prevents air reference contamination.
  • Industry-leading poison-resistant coating helps improve sensor durability.
  • High temperature resistance allows sensor location flexibility and consistent operation across a wide range of temperatures, including high engine temperatures. It also helps provide improved sensor reliability and durability.
  • Low power consumption reduces the vehicle's electrical energy requirements.
  • Robust construction resists thermal shock without cracking.
  • Demonstrated production flex fuel capability.

Delphi's Switching Oxygen Sensor (right) is designed for use with controllers that have a pumping current feature.  Delphi also offers a sensor (left) with additional features that complement controllers without a pumping feature.

Typical Applications

Delphi's Switching Oxygen Sensors can be used for passenger vehicle and commercial vehicle gasoline and alternative fuel applications (including ethanol blends E0 to E100) to help vehicle manufacturers meet current and future emissions regulations. They can also be used for motorcycles and other small engine applications.

Light-Off Signal Time

This chart shows the fast typical light-off signal of the Delphi Switching Oxygen Sensor.

Specifications (At 450°C engine dynamometer)

Rich voltage >720 mV
Lean voltage <120 mV
Rich to lean response time <100 ms
Lean to rich response time < 80 ms
Static lambda 1.005 (± 0.003)
Sensor light-off (450 ° C, as above) <12 seconds
Sensor time to activity (cross 300 mV) <8 seconds
Heater power at 13.5 V, 450°C exhaust 7 watts
Heater in-rush current at 21°C, 13.5 V <1.7 amps max

Performance Advantages

Delphi's Switching Oxygen Sensors offer cost and performance advantages versus conventional conical sensors including faster light-off time and a low-wattage heater. They can also help achieve lower cold-start emissions than conical sensors.

Compared to other switching sensors, Delphi's Switching Oxygen Sensors offer a pumped air reference and feature an isolated ground. They also feature industry-leading poison-resistant coatings, waterproofing, and a high-temperature internal seal to provide robust reliability versus other switching sensors.

The Delphi Advantage

Delphi has one of the industry's most complete portfolios of sensors and a thorough understanding of systems integration. Delphi offers global manufacturing capabilities for sensors and the benefits of more than 30 years' experience in powertrain sensors research and production. Delphi has produced hundreds of millions of exhaust sensors and can provide manufacturers with the necessary support and high quality, high value products tailored to specific customer requirements.

As a global leader in engine management systems technology, Delphi can help manufacturers around the world meet emissions requirements, improve fuel economy and enhance performance. Delphi is a source for high value solutions and our systems expertise is built into every product. Delphi's flexible engineering approach encourages collaboration. And, Delphi has a thorough understanding of automotive markets around the world and a global network of resources.