Review on Denso 234 9002 Fuel Ratio Sensor by Omar Malvo

Worked as advertised on my 1999 4Runner. My check engine light codes 1130 and 1135 have not returned since installing and cleaning. Don't get confused, this is the top AF unit, not the bottom O2 unit. This autofocus unit was much more expensive than other brands sold here, but chose to pay more for the Denso brand since too many people wrote negative reviews of cheaper units saying they didn't work or didn't last long. . Also, before purchasing this new unit, I watched a YouTube video that explained how to clean the sensor by removing it and spraying it with brake cleaner and even soaking it in gasoline overnight to remove the carbon deposits. However, before that I checked the device with a voltmeter and it didn't show any readings. After trying different cleaning methods, I tried again with a voltmeter and still showed nothing. So my block died electrically, not because it was clogged.