ACAUTO Oxygen Sensor 4-Pack for Chevy GMC Cadillac (234-4012 & 234-4018) — Direct-Fit, Fast-Heater

ACAUTO's 4-pack oxygen sensor set (234-4012 & 234-4018) is a direct-fit replacement designed to restore accurate air-fuel sensing on compatible Chevy, GMC and Cadillac V8/V6 vehicles.

These ACAUTO oxygen sensors are manufactured to match OE fit and function for upstream and downstream positions on many Silverado, Tahoe, Suburban, Sierra, Yukon, Express and Escalade models. Built from durable materials with a fast-acting heater element, the sensors are supplied with correct threads and pre-applied anti-seize where needed, making installation straightforward for mechanics and experienced DIYers. This description explains what these sensors do, which vehicles they fit, how they perform, and who should consider this 4-pack.

Which vehicle models and years will these ACAUTO oxygen sensors fit?

The ACAUTO 234-4012 and 234-4018 sensors are designed as direct replacements for many Chevy, GMC and Cadillac applications. They cover upstream (pre-catalytic) and downstream (post-catalytic) positions across light-truck and SUV platforms.

• Chevrolet: Silverado 1500/2500, Tahoe, Suburban, Avalanche, Astro, Express, C1500/C2500
• GMC: Sierra 1500/2500, Yukon/Yukon XL, Savana, Safari
• Cadillac: Escalade (models using these OE numbers)
• Confirm fit by OE number or vehicle year/engine before installation

How do these sensors compare to the original equipment parts?

ACAUTO sensors are engineered to match OE specifications for form, fit and electrical connections so they behave like factory parts once installed. Components include ceramic sensing elements, platinum conductive layers and 310S stainless steel protection for long life.

• Interchangeable OE numbers: 9617178, 234-4012, SG454, SG236, 13474, 234-4018
• Durable materials: platinum, ceramics and 310S stainless steel
• Pre-coated threads and OE-style harness connectors for simple swaps

What performance features should I expect after installation?

Expect accurate oxygen sensing that helps the engine control module maintain proper air-fuel ratios and catalytic converter monitoring. The fast-acting heater shortens warm-up time so the sensor reaches optimal temperature quickly and provides reliable readings sooner.

• Fast heater design for rapid operational temperature
• Responsive voltage output for steady oxygen measurement
• Suitable for both planar and wire-thimble sensor types depending on position

How easy is installation and what should I prepare?

Installation is intended to be straightforward: these are direct replacements with OE-style connectors and pre-applied anti-seize on threads. Basic tools and safety precautions are all that’s required, though a correct-fitting oxygen sensor socket and torque wrench are recommended for best results.

• Direct-fit OE connectors reduce wiring or adapter needs
• Threads pre-coated with anti-seize to ease removal later
• Recommended tools: O2 sensor socket, ratchet, torque wrench, penetrating oil

Who is this for: This ACAUTO 4-pack is aimed at owners, technicians and fleet managers working on late-model Chevy, GMC and Cadillac trucks and SUVs that require 234-4012 or 234-4018 style oxygen sensors. It’s a suitable option for those who want direct-fit replacements with durable materials and quicker sensor warm-up, whether you're replacing a faulty sensor, performing preventive maintenance, or servicing multiple vehicles.