Originally posted by MrFatBooty
When you get your car tuned on a dyno basically what they do is stick a wideband oxygen sensor up your tailpipe which gives a readout of the air/fuel ratios in relation to RPM.
The wideband 02 sensors I've been investigating actually are installed in place of your normal 02 sensor, and hook up to a controller box.
Is the "sniffer" they hook up at dyno time, the same thing? Maybe the direct plug-in one is just do to the fact you are doing it mobile?
Generally when people talk about dyno tuning, they refrence two sensors. Lambad, and O2 is it? I dunno, what is the other sensor?
-PHiZ