Top 20 2005 Lexus LS400 - Page 4 Questions & Answers

If all four tires are at the proper pressure then check the spare. It has a sensor too.

-Mostly coil. Good luck Mai

I'd have to guess that one of the door switches has failed. Check one by one and replace the bad one.

Need to know what year and what engine size you have in order to help....

Sounds like a bad coil. i would swap the coils to run 2,4,6,and 8 and see if those started to misfire. If 1,3,5,7 still misfire I would do a compression test. Has the timing belt been replaced yet.

Check the fuel filter and the fuel pump. Also check fuses.

Which fuse??

Look wireing harness that is close to it and strip the tubeing from or tape and see for a broken wire

battery and connection,spark plugs,fuel filter,air filter,starter.

it's an extremely hard thing to do without a diagnostic computer, because you need to see its reading compared to other variables while the engine is running.

The code for the sensor is the giveaway.The computer does not know how much fuel to give the injectors without that sensor working. The computer uses a factory set default reading.Assuming the cooling system is full of fluid, you should be able to test the circuit and the sensor with a meter and a scanner. The sensor is a resistance variable that takes a 5 volt reference from the computer and changes it depending on the resistance in the sensor.The sensor should read different resistance at different engine temps, and the harness should carry the voltage back to the computer. The scanner should show the sensor reading as the engine warms up.

Take a heat gun heat up line and pinch it shut.

Then a problem is occurring in the system, have the dealer scan it and see what is keeping it from starting. It may not be the alarm system, other problems may be occurring.

I'm pretty sure only Ford products have a safety switch for the fuel pump.

Well I would first ask why you would want them on. The computer grounds the fan relay when the fans are needed.They don't run until the ac is on or the engine reaches 220 degrees.Sometimes smoke in the radiator is a sign of a leaking head gasket.

HelloThe Engine and Automatic Transmission (not applicable to manual transmissions) in this vehicles drive train are fully electronically controlled by a computer called the PCM and TCM (Power Train Control Module, Transmission Control Module). When a problem like this or other drive-ability related problems occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM. Also always check fuel pressure for correct spec for your make and engine type.

idle air control valve is shot, replace it

remove the door panel the plastic clip attached to the window has broken away from the regulator arm. you can replace the regulator easily at that point or you can cut a 2x4 to fit and do not forget to unplug the regulator motor. jam the wood between the window and the bottom of the inner door frame.

Need to check next time it quits,pull a wire and see if it has spark,I suspect it is a ignition problem,not fuel.

are you sure you didn't blow a head gasket?is it whit smoke?