O2 Oxygen Sensor Downstream for Chevrolet Silverado 1500, Tahoe, Avalanche (2008-2013) 4.8L, 5.3L, 6.0L, 6.2L

Direct-Fit Downstream Oxygen Sensor Pair for 2008-2013 Chevrolet Silverado 1500, Tahoe, Avalanche (GMT900)

What it Does: The downstream oxygen sensor set monitors catalytic converter efficiency on the 2008-2013 Silverado 1500, Tahoe, and Avalanche to eliminate false check engine lights and verify proper post-catalytic exhaust scrubbing.

The Stock Chevrolet Silverado 1500, Tahoe, Avalanche Sensor Degradation

Factory planar zirconia oxygen sensors on high-mileage GMT900 trucks inevitably suffer from internal heater circuit fatigue and sensor thimble contamination from oil vapor, fuel additives, and extreme exhaust gas thermal cycling. As sensor responsiveness drops, the powertrain control module fails to evaluate catalytic converter efficiency accurately, generating persistent DTC fault codes such as P0420, P0430, or P0136 through P0161, forcing the vehicle into suboptimal emissions failsafe routines and failing state OBD-II inspections.

The Engineering Solution

This downstream oxygen sensor pair restores precise emissions monitoring using dual-layer ceramic sensing elements housed within corrosion-resistant 304 stainless steel casings. Engineered to meet strict factory response thresholds, each sensor features factory-calibrated pigtail harness lengths and OEM-spec sealed terminal connectors that plug directly into the factory loom without splicing. Precision threads install directly into factory exhaust bungs, providing rapid light-off response times and dependable millivolt data transmission directly to the Gen IV engine control module.

What's Included

• 2x Downstream Oxygen Sensors (Bank 1 and Bank 2 Post-Catalytic Converter)

Technical Specifications

Compatibility

• 2008-2013 Chevrolet Silverado 1500 (4.8L, 5.3L, 6.0L, 6.2L V8)
• 2008-2013 Chevrolet Tahoe (4.8L, 5.3L, 6.2L V8)
• 2008-2013 Chevrolet Avalanche (5.3L, 6.0L V8)
• 2008-2014 Cadillac Escalade & Escalade ESV (6.2L V8)

Frequently Asked Questions & Fitment Warnings

Does this fit the GMT900 Silverado 1500, Tahoe, Avalanche?

Yes, this is a direct fit for the 2008-2013 Chevrolet Silverado 1500, Tahoe, and Avalanche equipped with the Gen IV Small Block 4.8L, 5.3L, 6.0L, and 6.2L V8 engines in the downstream positions.

What tools and precautions are required for installation?

Use a dedicated 22mm (7/8-inch) slotted oxygen sensor socket, apply high-temperature anti-seize strictly to the threads while keeping the protective sensor thimble clean, and clear ECM trouble codes with a scan tool post-installation.

The Chevrolet Durability Standard

Constructed to endure severe exhaust vibration, heavy payload demands, and sustained towing conditions, these replacement sensors deliver reliable closed-loop communication for uninterrupted truck duty cycles.