just got the gendan obd2 adaptor [usb] with engine check software
i love the live graphs of the sensors - i.e lambdas
my pre cat lambda loops at 0.2 to 0.9 and the post lambda is a lot smoother and near enough static at idle at .39 - then goes up to .8 and down to .3 when revving the tits off - i.e more emissions 🙂
tested it with taking sensors off but i dont think it registered correctly as i didnt drive around for a while with the sensor detached
anyway it cost me around 80 quid including software
well worth it when the eml appears and u start panicking 🙂 - i got tired of the pin trick 😛