O2 Oxygen Sensor Upstream Downstream for GMC Yukon (2008-2014) 4.8L, 5.3L, 6.0L, 6.2L
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Direct-Fit Replacement Oxygen Sensor Kit for 2008-2014 GMC Yukon (GMT900)
What it Does: The 4-piece oxygen sensor kit monitors pre- and post-catalytic exhaust gas composition on the 2008-2014 GMC Yukon to optimize air-fuel ratios, restore fuel economy, and eliminate diagnostic trouble codes.
The Stock GMC Yukon Sensor Degradation
Factory oxygen sensors on the GMT900 platform are subject to high thermal cycling, oil vapor blow-by, and carbon fouling over extended mileage. As the factory zirconia elements age, response times lag, forcing the ECM into rich fuel trims, reducing catalytic converter efficiency, and triggering diagnostic trouble codes such as P0135, P0141, P0420, or P0430.
The Engineering Solution
This direct-fit kit provides complete bank-to-bank coverage with dual upstream air-fuel ratio monitoring and dual downstream catalyst monitoring. Built with high-grade planar ceramic sensing elements and integrated fast-acting heater circuits, these sensors deliver rapid closed-loop operation. Double-laser welded stainless steel housings shield internal substrates from moisture intrusion and exhaust soot, while pre-treated high-temperature anti-seize threads and factory-matched terminal connectors prevent signal drop across the Gen IV Small Block harness.
What's Included
- 2x Upstream Oxygen Sensors (Pre-Catalytic)
- 2x Downstream Oxygen Sensors (Post-Catalytic)
Technical Specifications
| Fitment | 2008-2014 GMC Yukon |
|---|---|
| Engine / Chassis | Vortec Gen IV V8 (4.8L, 5.3L, 6.0L, 6.2L) / GMT900 |
| Stock Output | 295–403 hp / 305–417 lb-ft |
| Replaces OEM Part # | 21546, 234-4254, 234-4407, 234-4668, 15284, 2344254, 2344668, ES20013, OS1656, OS2239, OS2240, OS2249, SG1857 |
Compatibility
- 2008-2014 GMC Yukon 4.8L V8
- 2008-2014 GMC Yukon 5.3L V8
- 2008-2014 GMC Yukon 6.0L V8
- 2008-2014 GMC Yukon 6.2L V8
Frequently Asked Questions & Fitment Warnings
Does this fit the GMT900 Yukon?
Yes, this is a direct fit for the 2008-2014 GMC Yukon equipped with the Gen IV Vortec 4.8L, 5.3L, 6.0L, and 6.2L V8 engines.
Do these sensors require wire splicing during installation?
No, these are direct-fit sensors featuring plug-and-play factory pinouts and correct harness lengths for OEM mounting locations.
The GMC Heavy-Duty Standard
Maintain consistent fuel mapping and preserve towing performance under heavy load by restoring precise closed-loop fueling management to your full-size truck powertrain.
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