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

Direct-Fit Replacement Oxygen Sensor Kit for 2008-2013 GMC Sierra (GMT900)

What it Does: The 4-piece oxygen sensor kit monitors pre- and post-catalyst exhaust gas composition on 2008-2013 GMC Sierra trucks to ensure precise closed-loop fueling and proper catalytic converter efficiency.

The Stock GMC Sierra Sensor Degradation

Factory oxygen sensors on GMT900 platform trucks routinely succumb to continuous thermal cycling, carbon buildup, and oil-vapor contamination. Over extended mileage, the internal zirconia sensing elements foul and degrade, causing sluggish switching rates between lean and rich fuel states. In Gen IV Small Block V8 applications, a lazy or dead O2 sensor skews short- and long-term fuel trims (STFT/LTFT), triggering fault codes such as P0135, P0155, or false P0420/P0430 catalyst degradation codes, while degrading fuel economy and drivability under load.

The Engineering Solution

This comprehensive 4-sensor package supplies matching upstream and downstream sensors engineered to restore factory air-fuel feedback loop speeds. Built with high-temperature stainless steel protective housings and robust ceramic zirconia sensing elements, these sensors resist soot fouling and thermal degradation. Direct-fit weather-pack harness connectors integrate cleanly with OEM harnesses, ensuring rapid heater circuit light-off, stable millivolt switching, and clean closed-loop engine management without custom wiring.

What's Included

• 2x Upstream Oxygen Sensors (Bank 1 Sensor 1, Bank 2 Sensor 1)
• 2x Downstream Oxygen Sensors (Bank 1 Sensor 2, Bank 2 Sensor 2)

Technical Specifications

Compatibility

• 2008-2013 GMC Sierra 1500 4.8L V8
• 2008-2013 GMC Sierra 1500 5.3L V8
• 2008-2013 GMC Sierra 1500 6.0L V8
• 2008-2013 GMC Sierra 1500 6.2L V8

Frequently Asked Questions & Fitment Warnings

Does this fit the GMT900 Sierra?

Yes, this is a direct fit for the 2008-2013 GMC Sierra 1500 equipped with the Gen IV Vortec V8 (4.8L, 5.3L, 6.0L, 6.2L) engines; verify harness plug configurations prior to installation as V6 models are excluded.

Do these sensors require wire splicing or aftermarket tuning?

No, these direct-fit sensors utilize factory-style locking connectors and standard thread pitch for a plug-and-play installation without ECM calibration.

The GMC Heavy-Duty Reliability Standard

Engineered for high-mileage work trucks subjected to sustained towing demands, this sensor kit restores reliable stoichiometric air-fuel control to maintain low emissions, steady idle, and peak hauling efficiency.