HQPASFY O2 Sensor Replacement 234-4012/234-4018 — Direct-Fit Corrosion-Resistant for Silverado Tahoe Suburban

The HQPASFY 234-4012 / 234-4018 oxygen sensor is a direct-fit replacement for many GM V6/V8 trucks and SUVs from the mid‑1990s to early‑2000s, restoring accurate air-fuel sensing and plug-and-play compatibility.

If your Check Engine light points to an O2 sensor or your vehicle is running rich, lean, or with reduced fuel efficiency, the HQPASFY oxygen sensor offers a robust aftermarket replacement engineered for classic Chevy, GMC, and Cadillac models. Built with corrosion-resistant materials and double laser-welded stainless steel, this sensor is designed to survive high-temperature exhaust environments while matching the original equipment connector and thread sizes for straightforward installation.

Which vehicles and engine sizes does this sensor fit?

This HQPASFY sensor replaces part numbers 234-4012 and 234-4018 and fits a broad list of GM trucks and vans. It supports multiple model years and engine displacements found in Chevy, GMC, and select Cadillac vehicles.

• Chevy: Avalanche, Silverado, Suburban, Tahoe, Express — various 4.3L, 4.8L, 5.0L, 5.3L, 5.7L applications (1996–2002 range).
• GMC: Sierra, Yukon, C/K trucks, Safari, Savana — compatible across 4.3L, 4.8L, 5.0L, 5.3L, 5.7L engines (1996–2002 range).
• Cadillac: Escalade 5.3L and 5.7L model years listed (1999–2002).
• Replaces OEM numbers: 234-4012, 234-4018, 9617178, SG454, SG236, 13474, 19178116, and variants.

How durable and reliable is the HQPASFY O2 sensor?

This sensor is built for longevity in harsh exhaust conditions. The sensing element and housing use high-temperature, corrosion-resistant alloys, and a double laser-welded stainless steel shell improves sealing and structural strength.

• Submersible welds provide a tight seal against moisture and contaminants.
• Stainless steel body resists rust and mechanical wear.
• Designed to tolerate prolonged heat cycles typical of exhaust systems.

What should I expect during installation and operation?

Installation is typically straightforward for anyone familiar with basic automotive work: unplug the old sensor, unthread it from the exhaust manifold or pipe, and thread in the replacement sensor, connecting the wiring harness. No special programming is required for direct-fit applications; the vehicle's ECU will use the sensor's feedback as usual.

• Direct-fit connector and thread size for plug-and-play replacement.
• Standard hand tools or an O2 sensor socket needed for removal/installation.
• Expect normal ECU adaptation; a code clear may be necessary after fitting.

What warranty and support does HQPASFY provide?

HQPASFY backs this oxygen sensor with a 24-month warranty, reflecting the manufacturer’s confidence in product quality and long-term performance. Customer support is available for fitment questions or installation guidance.

• Two-year limited warranty covering manufacturing defects.
• Contactable support for compatibility or installation help.
• Replacement guidance if product does not match vehicle specifications.

Who is this product for? Owners and mechanics working on late‑1990s to early‑2000s GM trucks, vans, and SUVs who need an OEM-style replacement sensor—particularly those restoring classic models or repairing vehicles showing O2-related trouble codes. It’s suited for DIYers wanting a direct replacement with durable construction, and for professional shops that require reliable aftermarket parts that match original fitment and function.