I keep getting the SES light and everytime I read the codes its P0130 - Upstream oxygen sensor or circuit fault (right bank). I replaced this sensor about 6 months ago when I first got the code. Lately, I have been getting this code now about every 3 days and then I erase it. Are there any things I could check that might be setting it off other than to assume the sensor is faulty and have to go out and buy another?