A-Premium O2 Oxygen Sensor 4-Pack for GM 5.3L V8 (2003–2005) — Heated 4-Wire Upstream & Downstream

A-Premium 4-pack of heated upstream and downstream O2 oxygen sensors replaces worn sensors to restore accurate air-fuel monitoring for GM 5.3L V8 engines.

If your 2003–2005 GM truck or SUV is showing reduced fuel economy, rough idle, or a check-engine light related to oxygen sensors, this A-Premium four-pack gives you both upstream and downstream replacements in one purchase. These threaded, 4-wire heated sensors are built to the original-style specifications and packaged as a convenient boxed set for quick installation without specialty tools.

Which vehicles will these oxygen sensors fit?

These sensors are designed for GM full-size trucks and SUVs with the 5.3L V8 engine from the 2003–2005 model years. Fitment covers upstream and downstream positions where the factory sensors are threaded into the exhaust system. Always verify your vehicle’s OEM part number to confirm compatibility before ordering.

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

How are these sensors constructed and what specifications matter?

Each sensor is a heated, threaded unit with a 4-wire female connector designed to match original equipment electrical and thermal behavior. The heating element helps the sensing tip reach operating temperature faster for reliable emissions monitoring and shorter closed-loop operation after startup.

• Sensor locations: upstream (pre-catalyst) and downstream (post-catalyst)
• Type: heated oxygen sensor with threaded mounting
• Connector: female, 4-wire harness compatible with listed GM models
• Sold as a package of four sensors in a protective box

Will installation be difficult and what tools do I need?

Installation is straightforward for anyone familiar with basic under-vehicle work. The threaded design and standard connector let you swap sensors without cutting or splicing; typical removal requires penetrating oil and an oxygen sensor socket or appropriate wrench.

• No special wiring or adaptors required
• Use an O2 sensor socket or 22mm wrench and a ratchet
• Apply anti-seize where recommended to ease future removal
• Reconnect the electrical harness securely and clear any codes after replacement

Who is this 4-pack best suited for? Drivers and DIY mechanics who own compatible Cadillac, Chevrolet, or GMC GM 5.3L V8 trucks and SUVs and prefer to replace all oxygen sensors at once will appreciate the value and convenience. Fleet owners, preventative-maintenance enthusiasts, and those troubleshooting persistent oxygen-sensor-related codes benefit from having both upstream and downstream sensors included.

Built from durable materials and shipped in a protective box, these A-Premium sensors include cross-reference compatibility with many OEM and aftermarket part numbers for an easier match. A-Premium backs every O2 sensor with a one-year unlimited-mileage guarantee so you can install replacements with confidence.