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Where Is The Ecu Located In A 97 Lexus Es300?

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Hey all, I am just wondering where my ECU ( what does this stand for anyways?) is located since I recently bought a chip that will hopefully provide me some better fuel efficiency. I have a clue it might or might not be located in near the glove box but not totally sure. I own a 97 Lexus ES300 and have the Haynes repair manual. Is the ECU also called a PCM by any chance?


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