Engine Warning Light

the first one we failed was another guy,i copped for one a few mnths later,one of our fellas had left and was working for stratstone jag,via him we found that said lamp would illuminate for assorted faults with the exact nature of the fault being indicated by the relevant dash message,queried it with the ministry via comp one and it was at this point I was informed that dash messages didn't constitute a failure(bout 10/12 yrs back)and that they were aware of the vehicles concerned and to p+a.disnt bother memorising any further than that.question asked,question answered,message printed to cya,p+a,next test please....