20 Most Recent 1999 Lexus ES 300 - Page 7 Questions & Answers

Any time the check engine light comes on the traction control will be disabled and the light will also come on. Start with scanning the engine computer for trouble codes to see why the check engine light is on. I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

You have a wire grounding somwhere, Look for any cut wires or frayed wires,

PO420 & PO430 --are worn out Exhaust ConvertersYou can research any Generic OBD2 Codes on theinternet & learn more than you need to knowA Converter is only good for 12 years & will only passinspection MAYBE for 14 yearsO2 Sensor Codes are PO170 thru PO 175, so youmay want to study on your own, as you were givenuseless advice

possible bad contacts in wire connector

Hi Tom, Open the glove locker and drop it all the way down. It's behind it and is fitted horizontally. Regards John

the knock sensors are located underneith the intake manifold on either side of the engine block. you have 2 of them

A mechanic would check for voltage at the fan relay and the fan motor.

Hi Susie, Turn on the head lights and get someone to observe them while trying to start. If they dim during trying to start, replace the battery. Regards John

What about the sway bat bushings? Check them

Great to hear you fixed it.

If it is clear water and your air conditioner is running, it is water from the evaporator which is normal.If it is not clear, it could be coolant from the cooling system.

Hi Sheri, happy that you managed to sort out the problem. The operation of the ABS pulsates as you have described. It sends a small electrical charge to the management system, telling the system when the brake is about to lock and momentarily releases that particular brake for that wheel. If the wheels lock when braking and the vehicle skids, control is lost. With ABS the skidding is eliminated and thereby making the vehicle safer. Regards John

This has been happening to my car as well. It typically happens when your oxygen sensors start to wear out. Mine does it once in a while and I have the local auto store reset it. Go to your nearest auto store and have them tell you what code it is and ask them to reset the OBD so the light goes out. If the light comes on right away and the code has to do with your oxygen sensors, have them replaced. There are three, two are easy to replace, one takes some effort as it is in a tough to get to spot. The dealer will charge you a fortune to replace them so do it yourself or through a local mechanic. It is a very simple task other then the access.

If you disconnect the battery to reset the engine light, make sure you have the code to reset the anti theft on the radio, otherwise your radio will not work

go to the daler

Well, it would seem that replacing the sensor twice would point to the ECM but not always.Code 125 means the engine is not reaching operating temp which is needed to put the system into closed loop. Closed loop means the ECM is looking at all of the sensor readings to determine fuel trim level instead of using pre-set values. On cars built in the late 1990s closed loop is supposed to happen within a few minutes of start-up to cut down on emissions.The code means the temp reading is below 195 degrees for too long, which is usually a faulty thermostat. Once in a while it is a faulty temp sensor.As for the other 3 codes, there could be a problem with the wiring between the O2 sensor and the computer. And that might be expensive to find. So the dealer may be hedging their bet with the ECM replacement idea. But that would not address the first code unless you have had the thermostat replaced and the cooling system is ok.