niblips
Most likely the bulb is bad, but here are some possible things to check first (if you haven't already):
1. If the other signals work, then the fuse and the flasher are still good.
2. When you put the left blinker on does it click really fast? If so, this is def. a bad bulb.
3. Try switching the driverside rear bulb with the passenger side rear bulb and see if the problem is reversed.
4. Check the contacts between the bulb and the sockett and clean if neccessary.
Hope this helps.
