Yes, carbon monoxide (CO) detectors do expire. Most CO detectors have a lifespan of 5 to 10 years, depending on the manufacturer. Over time, the internal sensors become less accurate and may not reliably detect dangerous carbon monoxide levels.

You can usually find the expiration date on the back of the detector or in the manufacturer’s instructions. If your detector doesn’t show a date and is more than a few years old, it’s best to replace it to ensure proper protection.

Expired or malfunctioning CO detectors can give a false sense of safety. Replacing them on schedule helps protect your household from carbon monoxide exposure, which is odorless, invisible, and potentially life-threatening.

If you’re unsure whether your detectors are properly placed or functioning, a licensed electrician can help evaluate your home’s safety devices and recommend upgrades if needed.