A-Premium 4-Pack O2 Oxygen Sensors for GM 5.3L V8 — Heated Upstream & Downstream, 4‑Pin Plug

The A-Premium 4-pack supplies four heated, threaded O2 oxygen sensors—two upstream and two downstream—designed to restore accurate air-fuel monitoring for compatible GM 5.3L V8 trucks and SUVs.

These A-Premium oxygen sensors are replacement sensors engineered for select Chevrolet, GMC and Cadillac vehicles that use a 5.3L V8 engine from the early 2000s. Each sensor arrives boxed, pre-wired with a 4-pin female connector, and is built with a heater element to help the sensor reach operating temperature quickly. The kit contains two upstream (pre-catalyst) and two downstream (post-catalyst) sensors so you can refresh both banks at once for consistent readings and smoother system performance.

Will these sensors fit my vehicle?

They are made to match factory fitment on a range of GM models. Check the model years and engine size carefully—these sensors are specified for the 5.3L V8 variants listed below.

• Cadillac Escalade 2005 V8 5.3L
• Chevrolet Silverado 1500 2004–2005 V8 5.3L; Suburban 1500 2003–2004 V8 5.3L; Tahoe 2003–2005 V8 5.3L
• GMC Sierra 1500 2003–2005 V8 5.3L; Yukon/Yukon XL 1500 2003–2004 V8 5.3L
• Compare vehicle part references: 250-24470, 234-4668, 350-34581 and OEM numbers provided

How do these heated sensors improve engine operation?

Heated oxygen sensors warm up faster than non-heated units, enabling accurate oxygen readings sooner after start-up. Faster activation helps the engine control module make better fuel-trim decisions during cold operation, which supports smoother idling and more consistent exhaust monitoring.

• Built-in heater reduces time to operating temperature
• Threaded mounting matches OEM installation points
• 4-wire female connector for direct plug-and-play replacement
• Includes both upstream and downstream sensors for matched performance

What are the installation and quality features?

Each sensor is constructed from durable materials and arrives in a protective box ready for installation. The threaded design and standard connector make swapping sensors straightforward; many installations can be completed with common hand tools and an oxygen-sensor socket.

• Manufactured from premium materials for long service life
• 4-pin female connector and 4-wire configuration for correct wiring
• Packaged as a set of four sensors—no need to order separately
• Simple threaded mounting; typically no special tools required

What reference numbers and cross-references should I check?

Use the supplied reference numbers to confirm compatibility with your vehicle’s parts list or aftermarket catalog. The kit lists both aftermarket and OEM cross-reference codes so you can verify fitment before ordering.

• Aftermarket references: OS5045 and 25024470 variants
• OEM/cross-reference numbers: 12569429, 12573005, 12573167, 12576131, 12583290, 12607410, 12609001, 12611127
• Legacy numbers included such as 2344668, 35034581 for comparison

Who is this for: This four-sensor kit suits DIY mechanics and professional technicians replacing oxygen sensors on compatible Chevrolet, GMC and Cadillac trucks and SUVs with the 5.3L V8 from the early 2000s. It’s ideal when you want a matched set of heated upstream and downstream sensors to restore consistent oxygen sensing across both banks—especially when troubleshooting fuel-trim codes, poor idle, or catalytic converter monitoring. Backed by A-Premium’s one-year unlimited-mileage guarantee, this pack provides a cost-effective way to replace all four sensors at once and avoid mismatched components.