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Its inside the top end of the motor. There are knock sensor inside the motor. You have to take off the manifold and top half/plate of the motor. Garage charged me 500 bucks to replace a bad sensor. The sensors run 240 bucks.
I own a 2000 avalon and had a similar issue, rough idle especially when stopped, car felt like it was going to stall. I had a couple error codes which included one of the o2 sensors and knock sensors. I replaced the pcv valve , and o2 sensor, both easy fixes, but tue knock sensor is in the top half of the engine. Cost me 500 bucks to replace, install knock sensor at shop. After knock sensor was replaced and other o2 sensor replaced, no more idle issues. What happens if an o2 sensor on one of
they are located under the intake manifold in the center of the engine. One is towards the front and one is towards the rear. The intake plenum and intake manifold will need to be removed in order to service the knock sensors. More commonly the harness fails.
the bank 1 is in the front of your car close to the radiator, the other one is the bank 2. I think you have to replace the bank 1 and bank 2 sensor and the po115 is the coolant temperature sensor, after you replace all these sensors and have the machanic reset or turn off the CHECK ENGINE light. check with the emmission inspector before you begin to replace all these parts. good luck