GM GENUINE PARTS NOx Sensor 12718742 — OE-fit Nitrogen Oxide Sensor for GM Engines, Plug-and-Play

GM Genuine Parts 12718742 is an OE-quality nitrogen oxide (NOx) sensor engineered to provide accurate exhaust NOx readings for compatible Chevrolet, Buick, GMC, and Cadillac engines.

This NOx sensor supplies the engine control module (ECM) with real-time nitrogen oxide measurements so the vehicle’s emission control systems can adjust fuel and aftertreatment strategies. Manufactured and validated by General Motors engineers, the 12718742 model matches the original equipment fit, form, and function for the vehicles it serves. Choosing a GM Genuine Parts sensor preserves factory specifications and supports reliable communication with the vehicle’s onboard systems.

How does the 12718742 NOx sensor integrate with my vehicle’s emission system?

The sensor measures NOx concentration in the exhaust stream and sends a voltage or current signal to the ECM. The ECM interprets that data to alter injection timing, regeneration cycles, or selective catalytic reduction systems as needed to manage emissions performance.

• Provides continuous NOx readings for closed-loop emission control
• Sends calibrated electrical output compatible with GM ECM inputs
• Designed to withstand exhaust temperatures and contaminants

What are the practical benefits of installing a GM Genuine Parts NOx sensor?

Using an OE-validated sensor reduces the risk of fitment problems, diagnostic confusion, or calibration mismatches that can occur with non‑OEM alternatives. This part helps maintain the same communication protocols and response characteristics expected by the vehicle systems.

• Factory-validated performance for accurate NOx measurement
• Plug-and-play fit to original wiring and mounting points
• Reduces troubleshooting time by matching OEM signal behavior

How do I know if 12718742 is compatible with my GM vehicle?

Compatibility depends on your vehicle’s model year, engine type, and exhaust system configuration. Consult your vehicle’s parts catalog, VIN lookup, or a GM dealer to confirm that 12718742 corresponds to the OE part number for your application.

• Match by VIN or original equipment part number for exact fit
• Available for specific Chevrolet, Buick, GMC, and Cadillac models
• Some GM Genuine parts may have appeared previously under ACDelco GM OE

What should I expect during installation and maintenance?

Installation is typically straightforward when replacing the original sensor: the unit mounts into the exhaust or aftertreatment housing and connects to the factory harness. Torque specifications and anti-seize recommendations should follow the vehicle service manual to avoid damage and ensure a secure seal.

• Requires correct thread torque and connector seating to prevent leaks or faults
• Inspect wiring and harness for heat or abrasion damage before install
• Replace if diagnostic codes indicate NOx sensor failure or out-of-range readings

Who is this for: The GM Genuine Parts 12718742 NOx sensor is intended for owners, technicians, and fleet managers who need a direct-fit, OEM-validated replacement for compatible Chevrolet, Buick, GMC, or Cadillac vehicles. It's especially suited for those who prefer parts designed and tested by GM engineers to maintain factory emission control behavior and simplify diagnostics and repairs.