Denso O2 Oxygen Sensor 234-4669 for GM Vehicles (Cadillac, Chevy, GMC, Hummer) — 4‑Wire 14.8" Harness

The Denso 234-4669 is a direct-replacement narrow-band oxygen sensor engineered to restore accurate exhaust oxygen readings and match original equipment fit for select Cadillac, Chevrolet, GMC and Hummer models.

Designed and tested to rigorous OE specifications, this Denso oxygen sensor offers a precision-built zirconia element, corrosion-resistant housing and a protective trap layer to help shield the sensing element from contaminants. It arrives with a 14.76-inch, four‑wire harness and is intended as a one-to-one replacement for many model-year applications, simplifying installation and helping the engine control module regain accurate air-fuel ratio feedback.

Which vehicles will accept the 234-4669 oxygen sensor?

This sensor is compatible with a broad range of General Motors vehicles across Cadillac, Chevrolet, GMC and Hummer nameplates from the early 2000s up through select later years. Compatibility covers various Escalade, Silverado, Sierra, Yukon, Avalanche, Camaro, Caprice, Corvette and H2 models—check your specific year and engine combination before ordering. The sensor replaces OEM numbers 12572705 and 12617332 in many applications.

• Cadillac Escalade, Escalade ESV, Escalade EXT (2003–2006)
• Chevrolet Silverado, Avalanche, Suburban, Camaro, Caprice, Corvette (selected years listed)
• GMC Sierra, Yukon, Yukon XL (selected 2003–2014 years)
• Hummer H2 (2003–2006)

How does this Denso sensor protect the engine control system?

The sensor includes Denso’s aluminum oxide trap and a PTFE filter to reduce exposure of the ceramic sensing element to silicone, lead and other contaminants. Those protections help the zirconia element maintain a quick and reliable voltage response so the vehicle’s ECU receives consistent oxygen-level data. A stable signal can improve combustion control and make diagnostics more straightforward.

• Aluminum oxide trap layer reduces contaminant poisoning risk
• PTFE filter limits efficiency-robbing particulates
• Refined zirconia element for responsive oxygen sensing

What are the physical and electrical features to expect?

The 234-4669 is a four-wire, narrow-band O2 sensor packaged with a 14.76-inch wiring harness for ease of routing and connection. It uses a corrosion-resistant stainless steel shell for long service life and ships as a single unit sized to match original equipment. Installation generally follows standard O2 sensor replacement steps and requires proper torque and connector mating for reliable operation.

• Four-wire design with 14.76-inch harness for direct plug-in
• Stainless steel construction to resist corrosion and wear
• Compact package: approximately 5.75 x 2.19 x 1.88 inches

Will this sensor simplify troubleshooting and service?

Because the part is built to OE form, fit and function, it reduces variables when diagnosing exhaust, emissions or fuel-trim related trouble codes. Swapping a degraded or contaminated sensor for this Denso unit can clarify whether a fault is sensor-related or caused by other system components. After installation, monitor live oxygen sensor voltages and fuel trim values to confirm healthy operation.

• OE-quality fit reduces installation mismatch issues
• Improved signal response aids ECU diagnostics
• Direct replacement for common GM OEM part numbers

Who is this for: Professional technicians and DIY mechanics who need a reliable, OE-grade replacement oxygen sensor for specific Cadillac, Chevrolet, GMC and Hummer vehicles. It’s suited for anyone replacing a failing O2 sensor, addressing emissions-related fault codes, or restoring proper closed-loop fuel control in compatible GM applications.