GM GENUINE PARTS Heated Oxygen Sensor AFS123 (19178924) — Direct-Fit OE Replacement with Integrated Heater

The GM Genuine Parts AFS123 (19178924) Heated Oxygen Sensor is a direct-fit OE-quality O2 sensor that measures exhaust oxygen levels so your engine control module can fine-tune air/fuel mixture and help maintain optimal emissions and fuel economy.

This heated oxygen sensor is engineered and validated to General Motors standards, designed to replace the factory-installed sensor on compatible GM vehicles. It provides the same fit, function, and performance expectations as the original equipment, and it integrates a heating element to bring the sensing element up to operating temperature quickly for accurate readings during cold starts.

How does this oxygen sensor affect engine performance?

The oxygen sensor reports exhaust oxygen content to the engine control module (ECM), enabling precise air/fuel ratio adjustments. When the ECM gets accurate sensor feedback, it can maintain the stoichiometric target near 14.7:1, which helps the engine run efficiently and with fewer emissions.

• Delivers real-time oxygen readings to the ECM for fuel trim corrections
• Supports consistent combustion timing and throttle response
• Promotes stable operation during warm-up thanks to the integrated heater

What makes this GM Genuine Parts sensor a reliable replacement?

This sensor is manufactured to GM OE specifications for fit, form, and function, and is backed by General Motors validation. That means plug-and-play compatibility on specified GM models and the same performance characteristics as the original component.

• Engineered and tested to GM standards for durability and accuracy
• Direct-fit design minimizes installation adjustments and diagnostics
• Heated element accelerates sensor readiness after cold starts

How do I know when to replace the oxygen sensor?

Signs of a failing O2 sensor include a persistent check engine light, reduced fuel economy, rough idle, or failed emissions testing. Diagnostic trouble codes related to oxygen sensor response or heater circuit faults are common reasons to replace the sensor.

• Watch for codes like P0130–P0167 or ECM feedback indicating slow response
• Monitor fuel mileage and idle quality for degradation over time
• Replace per vehicle maintenance intervals or when factory diagnostics recommend

What should I expect during installation and compatibility?

AFS123 (19178924) is a direct-replacement part for compatible GM vehicles and typically installs with standard O2 sensor tools. Use factory torque specs and inspect wiring/connectors during replacement to ensure a reliable electrical connection and seal.

• Direct-fit connector and thread size for specified GM applications
• No reprogramming required when replacing like-for-like OE parts
• Follow vehicle service manual for torque and anti-seize guidance

Who is this for: This GM Genuine Parts AFS123 (19178924) Heated Oxygen Sensor is intended for owners, independent shops, and professional technicians who need a verified OE-equivalent O2 sensor for GM vehicles. It’s appropriate for anyone replacing a failing or out-of-spec oxygen sensor and seeking the reliability and fitment confidence that comes with a GM-backed part.

• Features: Detect oxygen content in the exhaust gases to optimize emissions and fuel economy
• Features: GM-recommended replacement part for your GM vehicle’s original factory component
• Features: Offering the quality, reliability, and durability of GM OE
• Features: Manufactured to GM OE specification for fit, form, and function