These little guys actually measure the amount of oxygen left over after combustion in your engine. They send that information to the car’s computer – the engine control unit, or ECU – so it can figure out if the engine is running lean (too much air, not enough fuel) or rich (too much fuel, not enough air). It's a feedback system, constantly adjusting things to keep everything running smoothly. There are usually multiple sensors – one before the catalytic converter, and one after, to check the converter is doing its job too. Think of it like this: the ECU is the brain, and the oxygen sensor is giving it vital information about what's happening in the engine. The ECU uses that info to fine – tune the fuel mixture. It directly affects how efficiently your engine runs, and how clean the exhaust is. A healthy oxygen sensor is key to hitting those emissions standards. If an oxygen sensor fails, your car's fuel economy will likely drop. You might notice your car struggling to accelerate, or idling roughly. The check engine light will almost certainly come on – it's usually one of the first things that triggers it. A bad sensor can even damage your catalytic converter over time, which is a much more expensive repair. They don't last forever, and eventually they just get slow to respond or inaccurate. Fixparts Online has a pretty good selection of these, and replacing them is often a straightforward job, though sometimes they can be a little tricky to get to because of where they’re located in the exhaust system. You’ll notice if one goes bad, usually with a drop in gas mileage and that engine light. Secure your purchase: Oxygen Sensor (MPN DOX2021) includes 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, which saves you money on repairs in the long run. • We make parts for almost every type of vehicle, so there’s a good chance we have what you need. • Many car companies trust DENSO to put our parts in their vehicles when they’re first made – that’s a sign of quality. • DENSO is always working on new technology to make your car run more efficiently and reliably. Drive with confidence – choose DENSO parts at FixParts Online.