Try check the engine control unit.. It's located at passenger side under the plastic cover food step side wall.. I repair more then 30 units of this GS300 n ARISTO all with the ECU failure if check everything with the engine n sensor.. Also check if there is fuel supply coz some model build with hi-low fuelpump control module.
SOURCE: 2007 chevy cobalt ls won't
Ignition relay or fuse could be the problem. When you turn the key to start do you hear a fuel pump kicking on and or do you have spark when you hot wire the starter (I know it's hard to check while trying to start it)? You can email me back and I might be able to pinpoint it more.
SOURCE: I have a 1999 Lexus GS300. When trying to start
sounds like the pump and i think on moust lexus and toyota pump is in the gas tank under your back seat
SOURCE: lexus alarm
My GS 300 arlarm kept going off now for two months unless the battery is disconnected; the solution to my problem was that my key had an electrical fault. I confirmed it by placing the faulty key within a metal box or a steal pot with a heavy lid. upon doing so it stopped going off. I later purchased a new key
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