exhaust sensor

[noodle]

hi all, can anyone tell me whether or not the EGT (exhaust gas temp) sensor is the same thing as a lambda sensor


cheers

 

[Muttley]

Yes.

No, it isn't.

 

[noodle]

cheers


or maybe not

 

[Muttley]

EGT probe is only fitted to the LCR turbo and is an additional factor for the ECU to worry about. It modifies fuelling when the maximum temperature is reached (950°C or so) to prevent damage to turbo and exhaust manifold. This is a performance factor, closed-loop control allowing the turbo to boost up to the allowable EGT.

Lambda probes are fitted to all petrol cars with catalytic converters and are oxygen sensors, monitoring the exhaust before and after the catalyst, to check the catalyst is functioning and to help the ECU to balance the fuel quantity injected. They are part of the emission control system, and as such only affect performance in a negative way..

 

[noodle]

so this means they are different things then?

 

[Muttley]

Yes, completely different. EGT probe is a temperature sensor, an electronic thermometer. Lambda probes are oxygen sensors, measuring the amount of oxygen in the exhaust gas.

 

[noodle]

ha ha ok cheers