ATS Oxygen Sensor 2013-2016 OEM 12645561

This ACDelco oxygen sensor for 2013-2016 Cadillac ATS restores closed-loop fuel trim and emissions compliance.

The oxygen sensor reports exhaust-stream oxygen content to the ECU so the fuel trim can be closed-loop controlled. A lazy sensor causes poor fuel trim, cold-start smell, and long-term catalyst wear.Engine option(s): 2.0L.

Verify your fitment with the year, make, model, and trim of your vehicle before ordering. If you are not sure, contact us with your VIN or vehicle configuration and we will match the correct part to your application before you buy.

Cross-Reference

Manufacturer part number 12645561. Cross-reference: 12645561 Oxygen Sensor Right Cadillac AT. This is a ACDelco catalog part. Confirm the OE reference for your vehicle matches before installing.

Why You Might Need This

A lazy O2 sensor causes poor fuel trim, cold-start smell, and long-term catalyst wear. Replace before the downstream cat is damaged.

Installation Notes

Use anti-seize on the threads to keep future service possible. Route the sensor wire clear of exhaust heat and moving suspension components.

Shipping and Returns

Free shipping on orders over $75. Same-day shipping on in-stock parts ordered before 2:00 PM CT weekdays. Orders placed after the same-day cutoff ship the next business day. Every order ships from our climate-controlled warehouse; parts do not sit outside where humidity and temperature swings could damage packaging.

30-day return window on unopened, unused parts in original packaging. Open parts installed without verified fitment: no return, or up to a 40 percent restocking fee depending on condition. Brake friction material (pads and shoes) is safety-critical and cannot be returned once a pad has touched a rotor. If a part does not fit your vehicle as described, we cover the return shipping and make it right.