As old as our rabbits are getting buying a code reader is a good idea.i bought an Innova 3100 for 80,00. Not all reasders work n our cars. this one does.
As far as the bulbs go; i have had an indication of a burnt bulb without it being burnt out. I guess sometimes the bulbs that are close to burning out have high resistance that fool the system into thinking they are burnt. I just replace the bulb when it happens