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2003 Lexus ES 300 / Alarm goes off for no reason

I have a 2003 Lexus ES 300. The Alarm will go off sometimes right after I get out of the car... Fill it up at the Gas Pump and while I am standing there it just goes off. It has happend several times. The Alarm goes off even without the car being locked or the Alarm turned on. Any Ideas anyone?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 36 Answers

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

Posted on Mar 16, 2009

  • 105 Answers

SOURCE: REMOTE DOOR LOCK 1997 ES 300 LEXUS

Even if the remote is fairly new they can lose their programming you may have to have it re-programed

Posted on Mar 17, 2009

bunnydawg
  • 5158 Answers

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.

Posted on Apr 15, 2009

  • 1 Answer

SOURCE: car keys locked in trunk of 1999 lexus es 300

1. I presume your button on the dash (which opens the trunk) is not working. You could take that button out of the dash panel and manually activate the circuit by using the wires themselves.
2. If the "valet" key doesn't fit the trunk lock, see if the keys are visible through the center back seat access 'hole', make a wire hook attached to a broom handle, etc. and try to catch the ring the key is on. If the view is blocked by other things you can't move, figure out at way to move things in the trunk so you can get something to reach the key(s). Do you have other metal keys on the same keyring? If so, use a magnet to grab the whole set.
3. Have you considered taking out the rear seat? Do the bottom seat cushion first, then the back.
4. By now you have hopefully already gotten your keys back out of the trunk, but if not I hope one of these suggestions works. MW

Posted on May 12, 2009

c17hydro
  • 2984 Answers

SOURCE: location of fuel filter on 2000 lexus es 300

The fuel filter on the ES300 is located under the hood, on the driver's side, by the fenderwell.

Posted on Jul 12, 2009

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