Maxfavor Upstream O2 Oxygen Sensor Pair for 2003–2015 GM Vehicles — Direct-Fit, Pigtail Harness

Maxfavor 234-4668×2 is a pair of upstream O2 oxygen sensors engineered as direct-fit replacements for many 2003–2015 GM vehicles, restoring accurate air-fuel monitoring for the engine control system.

This pair of upstream oxygen sensors is designed to match factory fitment and electrical connections for a wide range of Chevrolet, GMC, Buick, Cadillac, Pontiac and Saturn models. Each sensor includes the compatible interchange numbers and a flexible pigtail harness so swap-in installation is straightforward for mechanics and experienced DIYers. The kit arrives with a one-year unlimited-miles warranty and basic installation guidance to help ensure a correct and lasting fit.

Which vehicles and engine locations will these sensors fit?

These Maxfavor oxygen sensors are intended primarily for upstream positions (pre-catalytic converter) on many GM models from the 2003–2015 model years. Fitment covers light trucks, sedans and SUVs across Chevrolet, GMC, Buick, Cadillac, Pontiac and Saturn lineups. Always verify compatibility with your vehicle’s year, make and engine code before purchasing.

• Common Chevy fits: Silverado 1500/2500/3500, Tahoe, Suburban, Avalanche, Impala, Malibu
• GMC fits: Sierra 1500/2500/3500, Yukon/Yukon XL, Acadia, Envoy
• Other makes: Buick Enclave, Cadillac Escalade/CTS, Pontiac G6/G8, Saturn Aura/Vue
• Check listed interchange numbers (e.g., 234-4668, 250-24470) against your OEM part

How do I install the Maxfavor upstream O2 sensor pair?

Installation is a straightforward mechanical swap when you have the right tools and precautions. Remove the old sensor with a proper O2 socket, compare the new sensor for identical connectors and thread size, and clean the threaded port before installing the replacement to ensure a good seal.

• Step 1: Locate and remove the old upstream O2 sensor using an oxygen sensor socket
• Step 2: Compare connectors and thread pattern to confirm match
• Step 3: Clean the sensor port threads and gently hand-start new sensor
• Step 4: Torque to manufacturer spec and reconnect the electrical plug; clear any trouble codes

What interchange numbers and part references should I check?

Maxfavor provides several common OEM and aftermarket interchange numbers so you can cross-reference your existing part. Use those reference numbers to confirm fitment on parts lookup sites or service manuals before purchase.

• Included interchange numbers: 234-4668, 250-24470, 12569429, 12573005
• Additional references: 12573167, 12576131, 12583290, 12607410 and others
• Compare the sensor’s plug, wire length and thread pitch to your factory unit

What warranty and support come with this O2 sensor set?

Maxfavor backs this pair with a one-year unlimited-miles warranty and accepts returns if the sensors don’t fit your vehicle. The seller also offers customer support and asks buyers to compare pictures and vehicle fitment closely before installation.

• 1-year unlimited-miles warranty included
• Return accepted if the sensor doesn’t match your vehicle (clean, packaged condition required)
• Customer support promise: respond to inquiries within 24 hours

Who is this for: This Maxfavor 234-4668×2 upstream oxygen sensor pair is intended for vehicle owners, independent mechanics and repair shops replacing faulty upstream O2 sensors on compatible GM vehicles. It’s suitable for buyers who need a cost-effective, direct-fit replacement with clear interchange references, straightforward installation steps and a one-year warranty. If you are unsure about fitment, compare your old sensor to the provided part numbers and photos or consult a technician before ordering.