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Can a problem with the transmission cause the engine light to come on. I had various codes for the past 6 months and have had all plugs and coils replace, had both O2 sensors, mass air flow sensor and rear OCV replaced, Now after about 200 miles light is back on, tach seems to run higher than usual now and car does not seem to downshift properly. Any ideas? Am going to have codes read tomorrow, (garage is closed today.)

Thanks for the tip about the speaker cowls but my noise seems to be coming around the fuse box by the steering wheel, its like a clicking sound.

How did you rebuild the mini speakers?

I seem to hear it when I'm stopped.only. What are Tweeters and the climate control? I do not have the heat or ac on.

I have a crackling noise in the car, can't tell if it's in the dashboard or under the dash, sounds electrical to me but have no problems with anything else. Any thoughts?

Just replaced all plugs and coils now tach is running funny. When I accelerate below 40 it will go to about 2,000 rpm before shifting into upper gear and tach falls to normal. When I go toward 60 tach will reach 3000 rpm or higher before shifting and going back to normal, If I just touch gas pedal from a stop tach zooms right to 2000 rpm. Any thoughts?

Had codes for misfire 1,3 and 5 cylinders. Replaced all 6 plugs and coils now car runs worse than before and check engine light will flash at times. Did I ruin cat or timing belt or could it be something simple I might have over looked? Any suggestions would be appreicated.

Thanks for the tip , I'll give it a shot and check the sensors. Can you clean the sensors with MAF cleaner?

Thanks for the info, I thought about replacing O2 sensors but they are pricey. Should I do the front one first, being it is easier to get to? Anyone ever try cleaning the O2 sensors? Can it be done?

Yes it was PO125 they replaced temp switch and sensor, Tell me this car sends false codes, so I wouldn't know where to begin. If they fix everything the code says and it still reads the same, what good are the codes if it happens to be a false one? I hate spending money and still havine the problem.

Took my 1999 Rx 300 in for PA inspection and it failed the emissions test. Mechanic replaced thermostat and both sensors but Check engine light still comes on they had to give me a waiver on the emission test because in PA if you spend over $150.00 they will give you a 1 year waiver. I don't know what to check now or where to start. Any suggestions what could be causing the Check engine light to stay on?

Okay, thanks, I'll go back to Autozone and have another scan done and see what code I get. If it is the exhaust manifold is that a do it yourself deal or leave it to a mechanic?

I had the code read at Autozone and it is PO125. Says insufficient coolant temperature for closed loop. Fuel control Probable cause Faulty thermostat CTS circuit faulty I have no idea what a CTS circuit is but figured I would replace the thermostat and see what happens.

How do I get or do a diagnostic test for the code?

Thanks for the picture and info, it will help me to find the location. I hope it's not much of a job, going to attempt it over the weekend.

I took my car to AutoZone and had the computer read which came up with PO125 code , saying faulty thermostat or CTS circuit faulty, not knowing what a CTS circuit is I thought I would replace the thermostat.

Does anyone have video or pictures of the location and how to replace the thermostat on my 1999 Rx 300? One thread said it was on the right under the air filter box and another said to follow the upper radiator hose which ends up on the left side of the motor. I purchased a new thermostat with rubber O rings but no traditional gasket for the housing. I'm not a big no it all about the Rx 300 but was just trying to save a few bucks doing it myself. Any input would be appreciated

I had the same problem. Its you battery have it charged or replace it. That wil fix it.

There is a set of decals you can order from Lexus dealers. I ordered a set last year cost about $7.00 then

Does anyone know of where I can download a parts catalog on line. It seems every time I want to order a part Im talking about the dealer does not know what Im interested in. It would be easier if I had a catalog to use for reference and just order by a part number or description. Im looking for uncommon parts, like the rear corner molding on the rear passenger door handle, or the roof screw cover for the spoiler.

Yes I click the lock button twice. The owners manual says that if you click the remote three times the turn signal lights will blink to let you know the car is locked, however when I do this the lights remain on. They only go off after the automatic timer shuts them off. I thought maybe the battery in the remote might need replaced.

I am not able to turn my headlights off with the remote key. When I leave the car and the lights are on I am able to lock the doors but the lights stay on. The lights will go off automatically after about 20 secs. I was able to turn them off with the remote before but not now. Any suggestions as to why?

I have a 1999 RX 300 and every time I start the car the clock is at 1:00 am. I have to reset the clock. Anybody have a clue as to why this happens? Also my transmission lights on the dashboard all work except for the drive light, could that be a bulb and if so can I replace it myself?

Lenore ,I found a independent that will do it for 3200.00 and I will take your advice and have the rear main seal replaced. THANKS FOR THAT TIP! Do you have the number for Lexus America? I am already in the process of filing a complaint with NHTS , just want to make sure I dont leave anything out, want to have all my facts down and make it sound as pathetic as this is for everyone on this forum. What kind of business ethics does Toyota/Lexus have, I would could not have this kind of problem with an auto and let it go out to the public. Albeit Greed and profit is what makes the world what it is today.