SES light just came on outa nowhere today. Engine still seems to run just fine. Went to Advance for them to check on any codes. They said it's a failed oxygen sensor heater on Bank 1 Sensor 1. I searched, but can't find out where this sensor is. Is there any danger in driving with this code until I can get to it over the weekend? Also, any advice on how to replace it would be much appreciated! Thanks.