CAMBIARE – Sensing and reducing emissions

CAMBIARE explains how vehicle electronics play a part in reducing a vehicle’s carbon footprint and reducing emissions.

Sensing and Reducing Emissions

Effective reduction of pollutants goes beyond ensuring that emissions control systems such as the catalytic converter (CAT) and diesel particulate filter (DPF) are up to scratch. Vehicle electronics and engine management systems are integral in optimising a vehicle’s efficiency and in turn, lowering its carbon footprint. Vehicle electronics and engine management specialist, Cambiare shares some points on the significance of sensors in reducing emissions.

lambda sensor


Lambda sensors are best known for monitoring air-to-fuel ratio (stoichiometric ratio) and relaying the information to the ECU when fitted just before the CAT (pre-CAT) in the exhaust system. They are vital in ensuring a vehicle’s optimal performance and aid in reducing harmful carbon emissions.

Traditional lambda sensors do the job of regulating the stoichiometric ratio. However, it has limitations in providing the ECU with an accurate reading of how rich or lean the air-to-fuel ratio is. Whilst traditional lambda sensors are still commonly used today, the technology has advanced to cater for tighter euro emission standards.

With the introduction of the 5-wire lambda sensor, the ECU is not only supplied with a signal that relays if the air-to-fuel ratio is running too rich or too lean, it also conveys by how much. This precise information is instantly sent to the ECU to allow the vehicle to rectify the air-to-fuel ratio more efficiently and effectively and increase the overall performance of the vehicle. They also have a heating element to speed up the sensor reaching the required temperature.

Additionally, lambda sensors can also be fitted after the CAT (post- CAT) to monitor its ability to remove harmful pollutants from exhaust gases. In the event that the CAT is not performing adequately, the lambda sensor will alert the ECU that will log a fault code and illuminate the engine management warning light.

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As CATs and DPFs are significant parts of the vehicle’s emissions control system, it is important to ensure that they are well maintained to ensure optimum performance and longevity. Exhaust gas temperature sensors (EGTS) and exhaust gas pressure sensors (EGPS) play integral roles in protecting the DPF.

cambiare egts sensor


The EGTS protects a vehicle’s exhaust system from overheating, which is especially important when a DPF regenerates. The DPF reduces the amount of soot that is released with exhaust fumes by collecting and storing it within the filter. Over time, soot accumulates within the filter and needs to be incinerated at extremely high temperatures to clear the exhaust and release it safely.

The EGTS monitors the heat produced from the exhaust, supplying the ECU with a signal to ensure that the temperature reached does not fall outside a vehicle’s safety parameters.

cambiare egps sensor


EGPS are often differential sensors that measure the pressure of gas between the intake and outtake of the DPF. By measuring the pressure, the EGPS communicates a voltage signal to the ECU. This enables the system to detect the level of soot and particles collected within the DPF. This information enables the ECU to monitor and detect when regeneration is required for efficient emissions reduction.


Backed by a 2-year/30,000-mile warranty, Cambiare parts are fully catalogued on the Cambiare website, MAM Autocat and the F:Drive. For more information, please speak with your local FPS representative.


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