Dyno questions and associated ramblings

jpit

Modshack,

I have a dashdyno that reads A/F ratio from three different sensors. The instructions do say that the car must have a wideband sensor (as opposed to narrow) to get a reading. Two of the sensor readings are very similar while the third seems to read very high (very lean). If our cars have a wideband sensor built in why can't they used that instead of installing a sniffer in the exhaust pipe?