Maxfavor Oxygen Sensor Set for Chevy GMC Cadillac — 234-4018 & 234-4012 Upstream & Downstream O2 Sensors, Direct Fit

The Maxfavor 234-4018 / 234-4012 oxygen sensor set is a direct-replacement upstream and downstream O2 sensor solution engineered to restore exhaust sensing for compatible Chevy, GMC and Cadillac models.

If your vehicle is showing reduced fuel economy, rough idle, or a check engine code related to oxygen sensing, replacing a worn oxygen sensor is a common, effective repair. Maxfavor supplies OE-referenced sensors that match common fitments and connector types for many Chevy, GMC and Cadillac vehicles built between the mid-1990s and early 2000s. These sensors are sold as direct-fit parts and include guidance to help you swap them in with basic hand tools.

Which vehicles and model years will these sensors fit?

Maxfavor lists broad compatibility across light trucks and SUVs from Chevrolet, GMC and Cadillac covering numerous model years. The coverage focuses on Silverado, Tahoe, Suburban, Avalanche, Sierra, Yukon, Savana and several pickup variants from 1996 through 2002 and nearby years.

• Chevrolet: Avalanche, C1500/C2500 pickups, Express, K1500/K2500, Silverado, Suburban, Tahoe (1996–2002, model dependent)
• GMC: Sierra, Yukon, Savana, C15/C25 and related pickups (1996–2002, model dependent)
• Cadillac: Escalade fitments for select years around 1999–2000

How do these Maxfavor sensors match original equipment specifications?

The 234-4018 and 234-4012 parts reference several OE numbers and aftermarket cross-references so installers can confirm fitment before purchase. Matching thread pitch, connector style and sensing element type reduces installation worries and helps the vehicle’s engine control module receive accurate exhaust readings.

• Cross-references include multiple OE and aftermarket numbers for quick verification.
• Parts are designed to match factory connector types and thread sizes for direct replacement.
• Both upstream (pre-catalyst) and downstream (post-catalyst) positions are covered by the listed part numbers.

What are the recommended installation steps and tips?

Installing an oxygen sensor is a straightforward job for anyone with a socket set and some mechanical sense. Follow basic precautions: work on a cooled exhaust, compare new and old sensors, and protect the sensor wiring during tightening and routing.

• Locate and remove the old sensor with the correct socket; let the exhaust cool first.
• Compare new and old sensors to confirm fit and connector compatibility before installation.
• Clean the threaded port, install the new sensor hand-tight, then torque to spec while keeping wiring free from sharp edges or heat sources.
• Reconnect the electrical connector and clear any stored trouble codes after installation.

What should I expect for performance and return policy?

Replacing a failing oxygen sensor generally helps the engine computer regain accurate air/fuel feedback, which can stabilize idle and fuel control. Maxfavor offers a return option if the sensor does not fit; follow their instructions and keep packaging in good condition.

• Improved sensor feedback is likely once the vehicle’s ECU receives correct upstream/downstream readings.
• Keep the original item clean and packaged if you need to return it for fitment issues.
• Confirm fitment using vehicle year, make, model, and referenced OE numbers before ordering.

Who is this for: This Maxfavor 234-4018 / 234-4012 sensor set is intended for DIY mechanics, independent repair shops and fleet owners working on late‑1990s to early‑2000s Chevrolet, GMC and Cadillac trucks and SUVs. If you need a cost-effective direct-replacement upstream and downstream oxygen sensor with OE cross-references and simple install steps, this kit is aimed at you.