Delphi ES10309 OE-Grade Oxygen Sensor Sensor - O2

The Delphi ES10309 is a direct-fit replacement oxygen sensor (O2 sensor / lambda sensor) engineered to OE standards by one of the world's leading original equipment manufacturers. Delphi supplies oxygen sensors to top global automakers, and every aftermarket unit benefits from that same OE heritage, design expertise, and rigorous validation process.

Key Features:

• OE-Grade Planar Sensor Technology: Delphi's planar sensor element with integrated heater reaches optimal operating temperature in as little as six seconds, enabling faster closed-loop activation and reduced cold-start emissions.
• Patented Contamination-Resistant Coating: A unique protective sensor coating resists silicone, phosphorous, and other fuel and oil additives that commonly trigger check engine lights and cause premature sensor failure.
• High-Temperature Water Seal: Protects the ceramic sensor element from water intrusion while also guarding against heat, vibration damage, and wire corrosion to preserve long-term signal accuracy.
• Direct-Fit OE Connectors and Harness: Features OEM-matching connectors and wire lengths for a straightforward, plug-and-play installation without cutting or splicing.
• Anti-Seize Compound Included: Comes with a high-temperature anti-seize compound (pre-coated or in-box) to prevent the sensor from seizing in the exhaust port threads over time.
• Validated for All Fuel Types: Tested for compatibility with gasoline and ethanol-blend fuels including E85, ensuring reliable performance across a wide range of fuel formulations.
• Durability Tested: OE-tested to 150,000 miles and subjected to 2,000 hours of severe thermal testing for proven long-term durability.

The oxygen sensor — also known as an O2 sensor or lambda sensor — monitors exhaust oxygen content to help the engine control unit maintain the precise air-fuel mixture needed for optimal combustion efficiency and emissions control. A failing O2 sensor can reduce fuel economy by up to 25% and trigger harmful emissions. Replacing it with a quality OE-grade unit like the Delphi ES10309 restores accurate engine feedback and keeps the check engine light off.