A-Premium Upstream O2 Oxygen Sensors 2-Pack — Heated 4-Wire Direct-Fit for Chevrolet & GM

A-Premium 2-pack upstream oxygen sensors are heated, 4-wire threaded replacements designed to restore accurate O2 readings on many Chevrolet, GMC, Buick, Pontiac, Saturn and Cadillac models.

These direct-fit upstream sensors are engineered to match the original equipment connector and mounting style so they plug into the factory harness and thread into the exhaust manifold or pipe without modification. Sold as a pair, they cover common upstream locations and include a female connector, boxed packaging and compatibility references for a broad range of GM-platform vehicles from the early 2000s through the 2010s.

Which vehicles will these A-Premium upstream O2 sensors fit?

They’re intended for many GM-family cars, trucks and SUVs; check the specific model years and positions before ordering. Compatibility varies by model and year — some applications use the sensors upstream only, while others accept upstream or downstream installation.

• Chevrolet: Silverado 1500 (2004–2011 depending on year and position), Suburban, Tahoe, Avalanche, Impala, Malibu, Corvette, Cobalt, HHR, Monte Carlo, Caprice
• GMC: Sierra 1500 (2003–2011 variations), Sierra 3500, Acadia, Yukon, Yukon XL
• Buick, Pontiac, Saturn, Cadillac: Enclave, Lacrosse, Lucerne, Rendezvous, G6, G8, GTO, Grand Prix, CTS, Escalade and more
• Reference part numbers included: 250-24470, 25024470, 12569429, 12573005, 12573167, 12576131, 12583290, 12607410, 12609001, 12611127, 8125731670

How are these sensors constructed and what are the key specifications?

These oxygen sensors are heated, 4-wire designs with threaded mounting that mirror many factory O2 sensors. The female connector and included wiring allow a plug-and-play installation in most compatible GM harnesses.

• Wire quantity: 4 (heated element plus signal/ground)
• Sensor type: Heated oxygen sensor for faster warm-up and stable readings
• Mounting type: Threaded — installs into manifold or exhaust pipe threads
• Connector gender: Female, designed for direct connection to OEM-style male harness plugs
• Package: Sold as a 2x Oxygen Sensor pack in a box

What should I expect during installation and performance?

Installation typically requires a threaded socket and standard hand tools; replacement upstream sensors usually sit before catalytic converters and are accessible from under the vehicle or at the manifold. After installing, drive cycles and engine management re-learning may be needed for adaptive fuel trims to settle.

• Tools: O2 sensor socket or deep 22–24 mm socket, ratchet, penetrating oil for seized threads
• Time: 30–90 minutes depending on vehicle access and rusted hardware
• Tips: Disconnect battery briefly on some models, avoid twisting wiring, apply anti-seize above threads if not pre-applied

How do I confirm I’m buying the correct A-Premium sensor for my vehicle?

Cross-check your vehicle’s year, make, model and engine with the fitment notes and reference numbers provided. If your vehicle appears in the fitment lists or matches one of the listed reference numbers, this part will likely match factory sensor shape and connector; always verify connector pinout and thread size where possible.

• Compare the reference numbers printed in the listing to your OEM or aftermarket part number
• Verify whether your vehicle needs upstream or downstream sensors and the correct bank/position
• Contact a technician or use VIN lookup if uncertain about position or asymmetrical fitment

Who is this for? This A-Premium 2-pack is for DIY mechanics, independent repair shops and fleet owners who need an economical, direct-replacement upstream oxygen sensor set for a variety of GM vehicles. It suits anyone replacing failing O2 sensors, addressing check-engine codes related to oxygen sensors, or restoring expected fuel-trim behavior — provided the vehicle matches the listed fitment and reference numbers.