These little guys measure the amount of unburned oxygen leaving your engine. Basically, they’re constantly checking what’s coming out of the exhaust. They send that information back to your car’s computer – the engine control unit, or ECU – as an electrical signal. Different sensors will read before or after the catalytic converter, and that changes what they’re checking for. Think of it like this: the ECU is trying to get the perfect fuel – air mixture for your engine to run efficiently. The oxygen sensor is its eyes and ears. It's telling the computer “Hey, there’s too much oxygen, lean it out a bit,” or “Not enough oxygen, add a little fuel.” It's a closed – loop system, so it's constantly adjusting to keep things running smoothly. There are usually multiple oxygen sensors in most modern vehicles – one before the catalytic converter and then at least one after. If an oxygen sensor goes bad, the ECU gets inaccurate information. This throws off the fuel mixture, and you’ll notice if that happens. Typically, you'll see a drop in gas mileage, rough idling, or even a failing emissions test. Sometimes it might even trigger your check engine light. A bad sensor can also potentially damage your catalytic converter over time, which is a much more expensive repair. We carry a good selection of these at Fixparts Online, and it's often something a good DIY mechanic can handle, but if you're not comfortable, definitely have a professional take a look. They really are key to keeping everything balanced and running right. Your trust matters: Oxygen Sensor (MPN DOX0123) comes with a 12-month warranty!

About DENSO

Denso is a global leader in automotive components from Japan, renowned for its advanced systems in thermal management and powertrains. Originating from Japan, Denso continuously drives innovation to enhance vehicle efficiency.

Why Choose DENSO?

• DENSO parts are known for lasting a long time, so you won’t have to replace them often. • They’re a top supplier to many car manufacturers, meaning you get the same quality parts originally put in your vehicle. • DENSO offers a wide range of parts, from spark plugs to air conditioning components, so you can find what you need. • They are constantly innovating and improving their technology to keep your car running efficiently. Drive with confidence – choose DENSO parts at FixParts Online.