Denso Oxygen Sensor 234-4012 Narrow-Band 4-Wire 15.35" Harness — Direct-Fit OEM Replacement

Built to OEM standards, the Denso 234-4012 is a direct-fit narrow-band oxygen (O2) sensor with a 4-wire, 15.35-inch harness designed to replace the original sensor in compatible late‑90s and early‑2000s vehicles.

This Denso replacement sensor restores the engine control module's ability to accurately monitor exhaust oxygen, helping the fuel system maintain the intended air-fuel ratio. Engineered and tested to the same tolerances as original equipment, the 234-4012 includes Denso's protective aluminum oxide trap layer and a refined zirconia sensing element to resist contamination and keep response times fast across its service life.

Which vehicles will accept the 234-4012 sensor?

The 234-4012 fits a broad selection of North American and a few international models from the mid-1990s through the early 2000s. Popular applications include many Chevrolet, GMC, Pontiac, Oldsmobile, Buick, Cadillac, Isuzu, Honda, Acura, Daewoo, and others — especially V6 and V8 platforms where a narrow-band upstream or downstream sensor was used.

• Common Chevrolet/GMC fits: S10, Silverado, Tahoe, Suburban, Blazer, Corvette, Astro, Express vans.
• Buick/Cadillac/Oldsmobile/Pontiac: Century, LeSabre, Regal, Fleetwood, Bonneville, Firebird, Grand Am.
• Other makes covered: Acura SLX, Honda Passport, Isuzu Rodeo/Trooper, Daewoo Lanos/Leganza.
• See vehicle list and model years to confirm exact compatibility before ordering.

How does this Denso sensor protect against contaminants?

Denso applies an aluminum oxide trap layer to shield the ceramic sensing element from silicone and lead compounds that degrade performance. Combined with a PTFE filter and corrosion-resistant stainless steel housing, the sensor maintains accuracy longer under real-world conditions.

• Aluminum oxide trap reduces silicone/lead poisoning risk.
• PTFE filter limits particulate and fluid intrusion.
• Stainless steel body helps prevent corrosion in exhaust environments.

What electrical and physical features should I know?

This unit is a 4-wire narrow-band design with a 15.35-inch pre-attached wiring harness for plug-and-play replacement on compatible connectors. The internal zirconia element offers responsive voltage change across oxygen levels so the PCM can adjust injector timing and fuel trim as intended.

• Connector: 4-wire harness, 15.35 inches long for easy routing.
• Sensing element: refined zirconia for quick response.
• Dimensions: compact form factor (approx. 5.75 x 2.19 x 1.88 inches packed).

Will this sensor fit in place of my original part numbers?

The Denso 234-4012 is offered as a direct replacement for multiple OEM and aftermarket interchange numbers. If your vehicle’s original sensor matches one of the listed interchange references, this Denso unit is intended to deliver first-time fit and function.

• Interchange references include 19178930, 96335927, 19178918 and others.
• Designed for OE-style fitment and original connector compatibility.
• Backed by Denso manufacturing and test standards for reliability.

Who is this for: The Denso 234-4012 is aimed at technicians and DIY owners who need a reliable, OE-quality narrow-band O2 sensor for late‑90s to early‑2000s GM, Buick, Pontiac, Oldsmobile, Cadillac, Isuzu, Honda/Acura and select Daewoo vehicles. It’s suitable for anyone replacing a failing or contaminated sensor who wants an exact-fit replacement built to original tolerances and treated to resist contaminant damage.