Oxygen Sensors

Do you want to read your air-fuel ratio precisely while tuning, or does a faulty oxygen sensor need replacing? We bring together oxygen sensors for gauges and engine management, upgrade kits with cable, and direct-replacement sensors. This category is for you if you work with engine management, data logging or repairs.

What does an oxygen sensor do?

The oxygen sensor measures the residual oxygen in the exhaust so the engine management or a gauge can tell whether the engine is running rich or lean. A wideband sensor measures across a wide range and is typically used with a controller or display when you adjust fuelling on a project with increased boost pressure. The signal is often used together with other engine management sensors, e.g. MAP sensors.

How to choose an oxygen sensor

• Purpose: For tuning and data logging you will typically choose wideband. For a replacement, the sensor must match the original type.
• Sensor generation: Bosch LSU 4.2 and LSU 4.9 have different connectors and electrical characteristics, so your controller must support that exact type. The category includes, for example, sensors from Innovate Motorsports and Haltech based on both generations.
• Cable length: The upgrade kits are available with 3, 8 or 18 ft cable – choose based on the distance from the sensor to the controller.
• Fitment: For direct replacement, the number of wires, the connector and the part number must match the car.

Installation and service life

The location depends on the exhaust, but the sensor is typically mounted with the tip pointing slightly downwards so condensation can drain off, and away from the hottest point of the exhaust manifold. Leaded fuel, oil consumption and coolant in the exhaust can shorten its service life. The category also includes sensors from Bosch, NGK, AEM and OMIX.

Frequently asked questions

What is the difference between a wideband and a narrowband oxygen sensor?

A narrowband sensor primarily shows whether the mixture is rich or lean around the ideal ratio. A wideband sensor measures a precise air-fuel ratio across a wide range and is therefore typically used for tuning and data logging.

Can I use an LSU 4.9 sensor with a controller made for LSU 4.2?

Typically not directly, as the two generations have different connectors and electrical characteristics. Check which sensor type your controller supports, or choose an upgrade kit that matches your equipment.

Does a new oxygen sensor affect the vehicle inspection?

That depends on the product and the car. A correct original-type sensor normally does not affect emissions negatively, but changes to the engine management can. Always check whether the specific part number and your setup meet the requirements.