Review on 🚗 KAX 250-54051 Upstream Oxygen Sensor: Compatible Replacement for Tacoma and 4Runner O2 Sensor by Paul Sanchez

My O2 sensor has a check engine light on. My smog check was due in 2 months. I decided to give this sensor a try since it was 1/4 the price at my local auto parts store. It was easy enough to install. I cleaned up the code. I noticed my engine was running a little rough, I thought the car needed to learn a new sensor. I drove it about 200 miles to prepare the monitors for the smog check. The smog station tested it and told me that I failed because my catalyst monitor wasn't ready and that I need to let it run some more. I drove another 2000 miles and the Catylist monitor wasn't ready. I spent the next 3 months researching and trying different things to get a monitor trigger. I almost installed new catalytic converters because I suspected they were bad. In the end I decided I could put my old sensor back in and see if anything changed. During my first test drive my engine ran normally again and the Catylist monitor was ready after my first test drive. I immediately checked it for smog (a month late) and passed. Keep in mind that my check engine light never came on again with the O2 sensor, but it definitely caused problems with my car, including the inability to pass smog (which is why I originally bought it). Save yourself the hassle and buy a more reliable product.