2000 lexus es 300 making a puttering sensation. Changed 02 sensor bank 1 and 2. Not sure if it could be something else like fuel issue or bad sparkplug.

SOURCE: where is sensor 1 bank 1 located on lexus rx 300 2002

facing engine bank1 sensor 1 should be the one at the firewall area in the manifold

SOURCE: 92 lexus es300 knock sensor

Need to remove the upper and lower air intake manifold.  There are two knock sensors for the front and rear pistons banks.  If you plan to do this yourself it is about 1 to 2 hours.  While you are at it, there is a short coolant bypass hose sitting in the same spot, replace it.  Another problem with the knock sensor is the wire harness used to connect the two knock sensors into one connection sometimes wears out and contacts the metal on the engine causing false signals to the ECM, so replace this cable also.
Just did this last summer on my 99 ES300.  Pretty easy.
DIYr

SOURCE: How many O2 sensors on a 1997 Lexus ES 300?

according to the manual i have... it has three.... one in the exhaust manifold.... and two in the exhaust pipe..... slightly vauge on the exact location of the last two sensors... but looks like it is after the catylitic converter.

mx5turbo92

• 545 Answers
• Posted on Jun 03, 2009

SOURCE: i to find where the fuel filter is located for lexus es 300 2002 so i can change thanks

is in the tanks w/the fuel pump,i hope this help good luck.

SOURCE: Where is Bank 2 Sensor 1 located on 99 Lexus ES

bank 2 sensor on the left front exhaust pipe.bank 1 sensor on the right of front exhaust pipe.