Diagnosis and lighting question.

Hi

So I have a warning light that comes on intermittently its the car on the lift in red. Now my mechanics said I must just bring it round to scan it when its on. But with my luck this damn thing only comes on at night or on the weekends. What do I need to be able to scan the codes myself? And where can I get the cable and stuff for the cheapest.

Now next question is I think my xenons are pointing to low. I have very little distance in terms of lighting but whats lit up is bright. Is there a reference to go by on how high they should be set? And am I correct in saying they can be adjusted on the light. I dont want to blind people. But I'd like to see as much as the road as possible at night.

Another lighting question, I've got LED angel eyes. Is it normal for them to do the "warm up test" where the both flash at the same time a couple of times then one said and then the other. My old aftermarket LED tail lights used to do it.

Thanks