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. Designed for durability: Oxygen Sensor (MPN ES20278-12B1) includes a 12-month warranty!

About Delphi

Delphi is a trusted name in automotive technology, offering advanced solutions in fuel systems, electronics, and thermal management.

Why Choose Delphi?

• Delphi parts are made to fit right and work like the original equipment in your vehicle, so you can trust the quality. • They offer a wide range of parts, covering many different makes and models – chances are they have what you need. • Delphi has a long history of innovation and is a trusted name in the automotive industry, known for reliability. • You'll get a good value for your money – Delphi parts are high quality without breaking the bank. Performance you can rely on – Delphi parts from FixParts Online.