Review on Labwork Parts Oxygen Sensor Downstream 2005 2010 by Ashwin Chauhan

I only replaced the A/F sensor in October and it has worked fine for a while. CEL will only light up again after 8 months, indicating that the A/F sensor is defective. I don't know how to contact the seller to replace the sensor (guarantee?). Contact details are not published anywhere. If the seller reads this, could you please provide contact information so I can get in touch with you and return the defective sensor for replacement? It was probably worth spending just a few bucks more and saving me the trouble of running back and forth to read the CEL.