"I recently failed to pass Ca. smog and after spending a lot of money trying to fix it turned out to be the O2 sensor.I am retired and have recently had surgery on my right hand so money is tight being on a fixed income, so when I went looking for an O2 sensor I was extremely pleased with the prices at wholesalesensors.com I ordered their less expensive sensor and was hoping all would turn out right.I talked to their support and they confirmed my choice and I ordered it.It came in the very next day and I installed it with one hand and it passed smog all without a single problem.Thank you wholesalesensors.com for providing an alternative to the high priced dealers."