Review on Denso 234 9023 Fuel Ratio Sensor by Ronggolawe Denney

This is a correct replacement part for the LEFT (driver side) upstream O2 (oxygen) sensor OE# 8946742010 on the engine exhaust manifold. He installed a check engine light. The heater in the original failed - Open when it should have read about 1.2 ohms. Heater wires - 2 black, blue and white - for motor feedback. This part is easy to replace, especially on the Rav4, as it sits right on the front of the engine within easy reach. The exchange takes about 15 minutes. I used a Lisle 12100 oxygen sensor connector which fits perfectly and really makes the job easier. You can also use a 7/8 ring wrench if you prefer. Then simply delete the check engine light with a code scanner and you're done. The engine adapts to the new sensor in a short time.