O2 Oxygen Sensor Downstream for GMC Sierra 1500, Yukon (2008-2013) 4.8L, 5.3L, 6.0L, 6.2L

Direct-Fit Downstream Oxygen Sensor Set for 2008-2013 GMC Sierra 1500, Yukon (GMT900)

What it Does: The Downstream Oxygen Sensor Set monitors catalytic converter post-catalyst emissions efficiency on 2008-2013 GMC Sierra 1500 and Yukon models to maintain proper closed-loop emissions calibration and eliminate false diagnostic trouble codes.

The Stock GMC Sierra 1500, Yukon Sensor Degradation

Factory oxygen sensors on GMT900 trucks operate in severe thermal environments directly downstream of the catalytic converters. Over thousands of heat cycles, soot accumulation, oil blow-by, and silica contamination coat the internal zirconia ceramic sensing element. This fouling slows sensor voltage response times and creates inaccurate switching thresholds, falsely reporting catalyst degradation and triggering persistent check engine lights such as P0420, P0430, or P0130-P0161 while disrupting long-term fuel trim feedback.

The Engineering Solution

This direct-replacement downstream pair is engineered to factory GM specifications with high-grade, double-shielded 304 stainless steel housings that prevent thermal shock and moisture intrusion. Featuring fast-acting internal ceramic heater elements and calibrated diffusion layers, these sensors provide millivolt-accurate signal feedback to the ECM. Each unit features factory-matched wire leads, high-temp silicone fiberglass protective sleeving, and OE-style sealed connectors for plug-and-play installation without cutting, crimping, or harness splicing.

What's Included

• 2 x Downstream Oxygen Sensors (Bank 1 Sensor 2 and Bank 2 Sensor 2)

Technical Specifications

Compatibility

• 2008-2013 GMC Sierra 1500 (4.8L, 5.3L, 6.0L, 6.2L V8)
• 2008-2013 GMC Yukon (4.8L, 5.3L, 6.0L, 6.2L V8)
• 2008-2014 Cadillac Escalade & Escalade ESV (6.2L V8)

Frequently Asked Questions & Fitment Warnings

Does this fit the GMT900 Sierra 1500, Yukon?

Yes, this is a direct fit for the 2008-2013 GMC Sierra 1500 and Yukon equipped with the 4.8L, 5.3L, 6.0L, and 6.2L Gen IV Vortec engines in the downstream positions (post-catalytic converter).

Do I need special tools or thread compound to install these sensors?

Installation requires a standard 7/8-inch (22mm) slotted O2 sensor socket, and anti-seize must be applied strictly to the threads while keeping the protective sensor probe tip completely clean.

The GMC Caliber

Built for the heavy-duty workload and towing demands expected of GMC trucks, these sensors deliver precise exhaust feedback under full gross vehicle weight ratings and severe operating temps.