YAOPEI O2 Oxygen Sensor 4-Pack for Chevrolet GMC V8 1996-2002 (2x234-4012 + 2x234-4018) — Direct-Fit Stainless Steel

YAOPEI 4-pack oxygen sensors replace upstream and downstream units (2 x 234-4012 + 2 x 234-4018) for many Chevrolet, GMC and select Cadillac V8 models from 1996–2002.

This kit provides a complete set of front and rear O2 sensors engineered as direct-fit replacements for a wide range of trucks, SUVs and vans. Each sensor is made with stainless steel housings and anti-oxidant coatings for corrosion resistance and stable performance at high exhaust temperatures. The set includes two upstream (pre-catalyst) and two downstream (post-catalyst) units so you can restore original-style sensor coverage in one service visit.

Which vehicles and years does this YAOPEI O2 sensor kit serve?

The 4-pack is designed to fit many Chevrolet and GMC full-size trucks, SUVs and vans from the late 1990s through the early 2000s, plus some Cadillac Escalade models. Compatibility lists include specific model ranges—verify your vehicle year, make, model and engine before ordering to ensure a correct match.

• Chevrolet: Avalanche, C/K trucks, Silverado, Suburban, Tahoe, Express vans (various years 1996–2002)
• GMC: C/K trucks, Sierra, Yukon/Yukon XL, Savana vans (1996–2002 ranges)
• Cadillac: Escalade V8 5.7 (1999–2000) and V8 5.3 (2002)
• Check interchange numbers 9617178, 234-4012, SG454, SG236, 13474, 234-4018 for guidance

How do these replacement sensors compare to OEM units?

YAOPEI oxygen sensors are built to meet the fit and function of original equipment using durable stainless steel housings and protective coatings. They are laser-welded and sealed against moisture to improve longevity in harsh exhaust environments, while response characteristics are tuned for reliable signal switching.

• Dual laser-welded stainless steel construction for leak-free housings
• Anti-oxidant coating to resist corrosion and high-temperature degradation
• Tested before packing to ensure proper electrical and sensing response
• Direct bolt-on design — no cutting, splicing or reprogramming required

What should I check before installing these O2 sensors?

Before purchase and installation, confirm the sensor plug, thread size and connector shape match your factory parts. Inspect interchange part numbers and compare product photos to your vehicle’s existing sensors; differences in plug or wiring can prevent fitment even when fitment lists match your model year.

• Confirm year/make/model/position and cross-reference listed part numbers
• Compare the connector plug in the product photos to your vehicle’s harness plug
• Replace sensors in pairs (upstream/downstream) per bank where recommended
• Use anti-seize on threads only if specified by install instructions

How easy is installation and what does the package include?

Installation is straightforward for anyone comfortable working under the vehicle with basic hand tools. These sensors are supplied as a set of four—two upstream and two downstream—so you can complete a full sensor refresh for many dual-bank engines without multiple orders.

• Package contains 4 PCS: 2 x 234-4018 and 2 x 234-4012 (2 front, 2 rear)
• Straight bolt-on replacement—no vehicle modification required
• Pre-tested units reduce risk of out-of-box failures
• Follow vehicle service manual torque and sensor removal guidance

Who is this for: This 4-pack is intended for owners and technicians who need a full bank refresh of oxygen sensors on late-1990s to early-2000s Chevrolet, GMC or compatible Cadillac V8 vehicles. It’s a practical choice for fleet maintenance, DIY truck or SUV owners, and repair shops seeking direct-fit, corrosion-resistant replacements that match common OEM interchange numbers. If you aren’t certain about fitment, confirm connector type and part numbers before purchase or contact us for assistance.