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Are a lambda probe and an exhaust temperature sensor the same thing?0%
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A Lambda probe and an exhaust temperature sensor are the same thing
Answer
Alessandro Marrapese
Owner of the Marra61 team, team manager, technician, telemetry expert and AIM reference point in Italy
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WELL DONE!

They are two different sensors, even if both are fitted to the muffler. In fact, an exhaust temperature sensor detects the maximum and minimum temperature of exhaust fumes: an important piece of information when checking whether carburetion is correct. It is fitted inside the exhaust pipe at a distance of about 15 cm from the exhaust port.
Compared to this sensor, a Lambda probe gives a more precise assessment of the actual state of carburetion, as it measures the amount of fuel and unburnt oil that remains inside the muffler, allowing us to understand the real “stoichiometric ratio“. As mentioned, a Lambda probe is also fitted to a kart’s muffler, but unlike an exhaust fumes thermocouple sensor, it does not have to be at a set distance. Both sensors can be used simultaneously to better assess the correct carburetion of an engine.

WRONG!

They are two different sensors, even if both are fitted to the muffler. In fact, an exhaust temperature sensor detects the maximum and minimum temperature of exhaust fumes: an important piece of information when checking whether carburetion is correct. It is fitted inside the exhaust pipe at a distance of about 15 cm from the exhaust port.
Compared to this sensor, a Lambda probe gives a more precise assessment of the actual state of carburetion, as it measures the amount of fuel and unburnt oil that remains inside the muffler, allowing us to understand the real “stoichiometric ratio“. As mentioned, a Lambda probe is also fitted to a kart’s muffler, but unlike an exhaust fumes thermocouple sensor, it does not have to be at a set distance. Both sensors can be used simultaneously to better assess the correct carburetion of an engine.