Mercedes-Benz Passenger A0065423918 Oxygen Sensor

Description

This oxygen sensor monitors the air‑fuel ratio to improve combustion efficiency. It is installed in the engine's exhaust system, commonly in EGR setups. The Mercedes-Benz Passenger model A0065423918 offers precise readings, enabling optimized engine performance and reduced emissions. The unit measures 50×100×140 mm and is manufactured in the Czech Republic.

Key Features & Benefits

These little guys actually measure the amount of unburned oxygen left in your exhaust. It’s basically checking how well your engine is burning the fuel. They send that information as a voltage reading to your car’s computer – the engine control unit, or ECU – so the computer can adjust the fuel mixture. It's constantly working to keep things running just right. Think of it as a key part of your engine’s feedback system. It doesn’t make anything happen directly, it just reports information. That report allows the computer to fine – tune the air – fuel ratio. There are usually multiple sensors; one before the catalytic converter, and sometimes one after to monitor the converter’s efficiency. The one before is the primary one for fuel trim.

Symptoms, Risks & Replacements

If this sensor goes bad, your car’s computer gets inaccurate information. That throws off the fuel mixture. You’ll likely notice if it’s really bad – things like poor gas mileage, rough idling, or even a failed emissions test. It can also damage the catalytic converter over time if the mixture is too rich. You can find replacements easily enough; Fixparts Online has a pretty good selection if you’re looking. It's a relatively inexpensive part to replace, and keeping it working properly can save you money and headaches down the road. It acts like a shield, protecting other, more expensive parts from damage caused by a poorly running engine.

Warranty Information

Mercedes-Benz Passenger Oxygen Sensor (MPN A0065423918) comes with a 1-year warranty.