Kwiksen Heated 3Pcs Air Fuel Ratio O2 Oxygen Sensor 1 Sensor 2 Upstream Downstream 234-9009 234-4215 Replacement For RX300 3.0L 1999 2000 2001 2002 2003

The upstream sensors fit okay, but the downstream sensor only has a clip but not the boot (I was lucky enough to get a version where the O2 sensor plugs in under the driver's seat rug. So had to buy a 4th sensor with the "boot" from AutoZone.

First tested was about 10.. ohm, replaced one and ran for few days then engine check light turns on with code cause by upstream sensor stop working, replaced another one (package was for 3 sensors) got same issued after couple days. Meter test on both again now shows 0 ohm. Those sensors last about 200 miles only, downstream sensor haven't use yet, don't know is it same quality as upstream sensor or not.It is really not a good production, have to request return all 3 of them and buy another brand with OE wideband.

Both of the up steam o2 sensors failed in less than 6 months. Heaters failed, open circuit. Replacing them with the OEM part. The car is driven short distances maybe 3 times a week. These sensors failed in less than 4,000 miles.

Awful I’ve had them in for less than 5 months and they already failed on me!! Heater circuit malfunctioned on two of them! Very disatisfied!!

First delivery had a dead senser and now after installed new ones, 2 sensors have just died after 2 months use!.Do not buy these, go with OEM, like Denso

Works great no issues

Arrived well packaged and on time. Installed them, seem to work ok. Did check out manufacturer before purchase and was surprised that they are U.S.

This item is mislabeled, it only contains one sensor. I ordered and returned it twice thinking it may be an error. Is is not an error.