A-Premium 4-Pack Oxygen Sensors for GM 5.3L V8 — Upstream & Downstream Heated 4-Wire

The A-Premium 4-pack includes heated upstream and downstream O2 oxygen sensors engineered to replace worn units on GM 5.3L V8 models, restoring accurate air-fuel monitoring.

If your Cadillac, Chevrolet or GMC with a 5.3L V8 is showing fuel trim faults, rough idle, increased emissions, or a check-engine light related to oxygen sensors, this set supplies two upstream and two downstream threaded, 4-wire heated sensors designed to match OE fit and function. Each sensor arrives boxed and ready for straightforward thread-in installation using common hand tools; no special programming is required in most vehicles.

Which vehicles and years will these sensors fit?

These oxygen sensors are specifically matched to a range of GM SUVs and trucks with the 5.3L V8 engine. They cover original equipment part references and are intended for late-model early 2000s GM platforms.

• Cadillac Escalade: 2005 V8 5.3L
• Chevrolet Silverado 1500: 2004–2005 V8 5.3L
• Chevrolet Suburban 1500 and Tahoe: 2003–2005 V8 5.3L
• GMC Sierra 1500 and Yukon/Yukon XL 1500: 2003–2005 V8 5.3L

How do these sensors match original equipment specifications?

Each sensor in the 4-pack is a heated, threaded unit with a female connector and four wires, matching common OE electrical and mounting characteristics. A-Premium cross-references several OEM part numbers so installation aligns with factory expectations.

• Sensor type: heated, threaded, 4-wire, female connector
• Included quantity: 4 oxygen sensors (upstream and downstream coverage)
• Cross-reference numbers: 250-24470, 234-4668, 350-34581, OS5045 and others
• Packaging: each sensor boxed for protection and shipping

What should I expect during installation and first use?

Installation is designed to be quick for anyone comfortable working under a vehicle: the sensors thread into the exhaust ports, reconnect to the factory harness, and the vehicle's ECU re-learns from the new sensor readings. No special calibration tools are normally necessary, but anti-seize and proper torque are recommended to avoid future removal issues.

• Tools needed: oxygen sensor socket or deep 7/8" wrench, ratchet, anti-seize (if absent)
• Time estimate: roughly 30–90 minutes depending on access and vehicle
• Post-install: ECU may require a short drive cycle to update fuel trim and diagnostics
• Tip: replace the upstream and downstream sensors in matched sets for consistent readings

How durable are these sensors and what warranty is included?

These sensors are built from corrosion-resistant materials and include the heating element required for rapid activation after cold starts. A-Premium stands behind the set with a one-year unlimited-mileage guarantee, giving added protection against premature failures.

• Construction: premium materials for longevity against heat and exhaust gases
• Warranty: one-year unlimited-mileage coverage from A-Premium
• Quality note: packaged individually to reduce transit damage

Who is this for: This 4-pack is intended for owners or technicians servicing 2003–2005 GM full-size trucks and SUVs equipped with the 5.3L V8 who need a complete upstream and downstream sensor replacement set. It’s well suited for DIY mechanics seeking an OE-style, heated threaded sensor with easy installation and for shops looking to stock a reliable, cross-referenced aftermarket option.