my astra van 1700td w reg 2000 low blow engine is doin my head in,the eml light keeps comin on and stayin on then sometimes it wont come on then it will flash now and then. Wen i finally found 16pin plug (under handbrake)it only had a few pins in , was goin to have go at using paperclip to find out codes but unsure now whitch connections to use .Can any 1 help with my problem as crackin me up not noing wots wrong thanks Dave