I had a strange problem happen this morning on my way to work. I stomped on the gas & the motor sputtered due to a bad O2 sensor, and as it did, the low beams & the driving lights went out. The highbeams still work, so thankfully I was able to get to work & back. I checked both of the fuse & they were good, but if I'm not mistaken, the headlights do have a relay, correct? If so, were is it located & how can I check it?