A-Premium Upstream O2 Oxygen Sensor 2-Pack for Chevrolet GMC Buick Cadillac — Heated 4‑Wire OEM Fit

A-Premium 2-pack upstream oxygen sensors replace faulty O2 sensors to restore accurate air-fuel readings for compatible Chevrolet, GMC, Buick, Cadillac and Pontiac vehicles.

If your check engine light points to an oxygen sensor or your engine is running rough, swapping in a matched pair of upstream sensors can help the vehicle’s computer regain precise exhaust feedback. These A-Premium sensors are heated, threaded units with a four-wire female connector and come as a boxed two-piece set designed to match OEM fitment references for many GM models from early 2000s through mid-2010s.

Which vehicles will these A-Premium upstream sensors fit?

This 2-pack covers a broad range of General Motors platforms. Fitment spans Chevrolet, GMC, Buick, Pontiac, Saturn and Cadillac models across multiple years; some late-model vehicles use these as upstream sensors while a few older models accept them upstream or downstream.

• Common Chevy fits: Cobalt, Equinox, Silverado 1500/2500/3500, Tahoe, Suburban, Impala, Malibu, Avalanche, Corvette, HHR, Monte Carlo.
• GMC and Yukon families: Sierra 1500/3500, Acadia, Yukon/Yukon XL, Sierra 1500 (2007–2011 upstream right).
• Cadillac, Buick, Pontiac & Saturn applications listed: Escalade, CTS, Enclave, Lucerne, G6, G8, Torrent, Aura, Ion, Montana, Bonneville and others.
• Reference numbers supported: 250-24470, 12569429, 12573005, 12573167, 12576131, 12583290, 12607410, 12609001, 12611127, 8125731670.

What are the technical specifications and connector details?

Each sensor in the A-Premium kit is a heated, threaded oxygen sensor built with a four-wire harness and female connector. The heating element enables quicker sensor activation and more reliable readings during cold-start and transient driving conditions.

• Wire quantity: 4 (heater plus signal/ground wiring).
• Sensor type: heated zirconia-style oxygen sensor.
• Mounting type: threaded for direct replacement into the exhaust bung.
• Connector gender: female for plug-and-play with matching factory harnesses.
• Package: two sensors, boxed for protection in transit.

How do these sensors help with typical driveability or emissions issues?

Faulty upstream sensors often cause incorrect fuel trims, rough idle, reduced fuel economy, or emissions test failures. Replacing a worn sensor with an appropriate upstream unit provides accurate oxygen readings so the engine control module can adjust fuel delivery correctly.

• Restores accurate oxygen-level feedback for closed-loop fueling control.
• Helps stabilize idle and improves transient throttle response.
• Can reduce unburned hydrocarbons by enabling proper air-fuel ratios.
• May resolve related check-engine codes (diagnostic confirmation recommended).

Who is this A-Premium 2-pack designed for?

This replacement set is intended for do-it-yourself mechanics, independent repair shops and fleet technicians working on compatible GM vehicles who need a cost-effective, direct-fit upstream oxygen sensor solution. It’s best for owners who have confirmed O2 sensor-related codes or poor running symptoms and who require an OE-style heated sensor with a four-wire connector for reliable plug-and-play installation.