Originally Posted by cheese_man
why do think that oxygen sensors have built in pre-heaters , because the sensors needs to be heated quicker than the exhaust gas when the engine is started and warming up
i have spent over 8 hours reading various articles on oxygen sensors .
and the main concensus is that the bosch sensors are crap
heck even mechanics in germany switch german cars over to japanese oxygen sensors
The heater circuit serves 1 main function, being the resistance is inversely related to temperature (it behaves as an NTC) and with a malfunctioning heater the sensor will not be able to pull the reference voltage down close to zero. As a result the sensor can not switch accurately without being warmed up. The quicker this can be achieved, the quicker the vehicle can manage the pulse-width by adjusting the STFT and reduce pollution.
heater circuits with ceramic elements that get wet with condensation can instantly kill the sensing element, how do I know? (I messed this up once myself)
You have 8 hours reading about oxygen sensors.
I have 12 years of professional tuning experience installing and tuning cars with them, 3 years of OEM engineering experience along with 2 engineering degrees. You may be more qualified to speak on them though
I use bosch oxygen sensors on my personal cars (including my race car) and recommend them on the cars I work on.
I see no real difference in NTK vs Bosch - both are OEM name brand with OEM quality.