GM GENUINE PARTS Heated Oxygen Sensor 213-3866 — OE-Fit Direct Replacement with Heater Circuit

GM Genuine Parts 213-3866 (12583804) is a direct-replacement heated oxygen (O2) sensor engineered to restore accurate exhaust oxygen readings for GM vehicles.

This heated oxygen sensor monitors oxygen levels in the exhaust stream and supplies precise feedback to the engine control module (ECM), enabling the ECM to fine-tune the air/fuel mixture. Built to General Motors specifications and backed by GM validation, the part replaces the original factory sensor to help maintain emissions control, driveability and fuel efficiency without guesswork.

How does this O2 sensor affect engine performance and fuel economy?

A properly working O2 sensor ensures the ECM receives accurate exhaust oxygen data so it can adjust fuel delivery toward the target stoichiometric ratio. When the sensor is performing as designed, combustion is closer to the ideal balance, reducing unburned fuel and lowering emissions while helping maintain smooth engine response.

• Provides real-time oxygen readings for ECM adjustments
• Helps maintain near-optimal 14.7:1 air/fuel ratio under typical conditions
• Supports consistent combustion for better throttle response
• Contributes to improved fuel efficiency relative to a failing sensor

Why choose the GM Genuine Parts 213-3866 instead of an aftermarket sensor?

This sensor is manufactured to GM OE specifications and is the factory-recommended replacement for compatible GM vehicles. Using a GM Genuine Parts sensor reduces fitment issues and ensures the heater circuit, connector, and calibration match the original component the vehicle was designed around.

• Designed and validated by General Motors for GM vehicles
• OE-fitment for correct connector and mounting geometry
• Built to the same performance and durability targets as the original part
• Backed by GM parts support and quality standards

What are the installation and compatibility considerations?

Installation typically involves replacing the sensor in the exhaust system at the designated threaded bung and reconnecting the electrical plug. Always verify the part number against your vehicle’s VIN and model year to confirm fitment, and follow safe lifting and cooling procedures before working on the exhaust.

• Threaded installation into the OEM exhaust bung
• Reuses existing wiring harness and connector designed for the OE sensor
• Confirm compatibility by checking part number 213-3866 or OEM 12583804 against vehicle application
• Observe cooling time and proper torque during installation

How long can I expect this sensor to last and what affects lifespan?

Service life varies with driving conditions, fuel quality, and exposure to contaminants, but OEM-style heated sensors generally last many tens of thousands of miles under normal use. Regular maintenance of the engine and exhaust system helps preserve sensor health and accuracy.

• Typical lifespan depends on mileage and operating conditions
• Contaminants, oil or coolant leaks shorten sensor life
• Heater circuit helps faster warm-up, improving operation on short trips
• Timely replacement prevents long-term fuel trim and emissions issues

Who is this for: Drivers and technicians who need a direct, GM-recommended replacement oxygen sensor for GM vehicles—owners seeking OE fit, correct connector compatibility, and the assurance of parts validated by General Motors. Choose the GM Genuine Parts 213-3866 when you want the same specifications and performance targets as the vehicle’s original sensor to maintain emissions control, fuel efficiency, and reliable engine management.