Dealing with check engine lights or poor fuel economy? This A-Premium downstream oxygen sensor might be exactly what you need if you drive a Chevy Cobalt, HHR, Pontiac G5, Saturn Ion, or several other GM vehicles from the 2000s. It's a direct replacement for part numbers 12565680, 12578576, and several others. The downstream sensor monitors your catalytic converter efficiency and helps your engine computer fine-tune the air-fuel mixture. This one is heated with a 4-pin connector, 760mm overall length, and threaded mounting - exactly like your original equipment. Installation is pretty straightforward if you're comfortable with basic automotive work, though sometimes those old sensors can be stubborn to remove. I'd recommend using some penetrating oil and the proper O2 sensor socket to make the job easier. The quality feels solid, and it comes with A-Premium's one-year unlimited mileage guarantee which is nice peace of mind. Just make sure to check your specific year, make, and model before ordering since fitment varies even within the same vehicle line. If your gas mileage has been dropping or you're getting catalytic converter efficiency codes, replacing your O2 sensors is one of the first things to try before spending big money on other repairs. This sensor should get your engine running efficiently again and hopefully turn off that annoying check engine light for good.
Free 30-day returns 
Free 30-day returns
