A-Premium 4-Pack O2 Oxygen Sensors for GM Trucks & SUVs — Upstream and Downstream Direct-Fit Kit (2008–2014)

A-Premium’s 4-pack of upstream and downstream oxygen (O2) sensors provides direct-fit replacements to restore accurate air-fuel monitoring on compatible GM trucks and SUVs.

If your vehicle’s check-engine light flagged an O2 sensor, or you notice rough idle, poor fuel economy, or failed emissions testing, replacing both upstream and downstream sensors can be a practical repair. This kit is built to match original equipment connector styles and wiring lengths for many GMC, Chevrolet, Cadillac, Pontiac and Saturn models from 2008–2014, offering an affordable way to get the engine management system reading correctly again.

Which vehicles will these oxygen sensors fit?

These sensors were selected to cover a range of GM platforms and engine sizes commonly used in full-size trucks and SUVs. Compatibility includes multiple model years and V6/V8 displacements; always cross-check part references or VIN-specific fitment before ordering.

• GMC Sierra (1500/2500/3500) and Yukon/Yukon XL models across 2008–2014 engine options.
• Chevrolet Silverado, Avalanche, Tahoe, Suburban, and Malibu model years and engine variants listed in the product fitment.
• Cadillac Escalade (including ESV/EXT), Pontiac G6, and Saturn Aura/Vue where applicable.
• Reference numbers included to help verify OE correspondence (examples: 12573167, 12609001, ES20013).

How do upstream and downstream sensors differ and why replace both?

Upstream sensors (pre-catalytic converter) measure exhaust oxygen for fuel trim adjustments; downstream sensors (post-catalytic converter) monitor converter efficiency. Replacing a failing pair ensures correct feedback to the engine control module and consistent performance after the repair.

• Upstream sensors provide real-time air-fuel ratio data for engine tuning.
• Downstream sensors confirm catalytic converter operation and emissions control.
• Replacing both prevents mismatched signal behavior and repeated diagnostic trouble codes.

What can I expect in terms of fit, wiring, and installation?

The kit includes four direct-replacement sensors with matched plugs and harness lengths designed to align with factory routing. Installation is typically bolt-on with a standard oxygen sensor socket; some jobs may require rust-penetrant or basic underbody access tools.

• Direct-fit connectors to simplify plug-in without splicing or rewiring.
• Wire lengths matched to factory locations for upstream and downstream positions.
• Standard sensor hex flanges for use with common O2 sensor sockets or wrenches.

Will using this A-Premium kit affect emissions testing or engine performance?

Replacing worn or failed O2 sensors helps restore proper engine control and emissions monitoring but does not alter emissions systems themselves. When installed correctly, fresh sensors can reduce false fault codes, improve fuel metering, and help your vehicle meet emissions checks consistent with factory expectations.

• Corrects erroneous oxygen readings that can cause rich or lean conditions.
• Helps clear downstream codes related to catalytic converter efficiency when converter is functioning.
• Supports stable idle and fuel economy by providing accurate feedback to the ECU.

This A-Premium 4-pack is aimed at DIY mechanics, independent repair shops, and fleet owners who need a reliable, cost-effective replacement set for GM trucks and SUVs from the late 2000s to mid-2010s. If you’re troubleshooting O2-related diagnostic trouble codes, preparing a vehicle for emissions testing, or simply restoring proper fuel control after sensor wear, this kit supplies four matched, direct-fit sensors with multiple OE cross-reference numbers and a one-year unlimited-mileage quality guarantee for peace of mind.