When can you expect to have strut problems? Looking at a 1999 Lexus ES 300 (121,000 mi.) and am trying to determine if it has a strut problem. Also, what would be the cost for replacement?

my car I got a 1999 lexus es300 and the ligt of ECR is tur on, what is it ?
Itried to scan with my bosch tool but nothing appeared.

It doesn't have one. That function is done by the Powertrain Control Module directly to the coils.

Those systems are controlled with sensors on the wheels. One may not be lined up well enough to sense the speed of the tire or the mechanic broke one and didn't tell anybody.

Check this website you find there fuse box diagram and description for Lexus ES300 (2000 - 2001)

http://www.autogenius.info/lexus-es300-2000-2001-fuse-box-diagram

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.

You must remove the rear seat back and package tray to access the bolts at the top of the strut assembly. The rest is done with the vehicle in the raised position. You will need a jack for all systems and may need some special service tools if you have the electronic modulated suspension.

I HAD THE SAME PROBLEM WITH 199 ES 300 LEXUS. TRY CHANGING THE POSITIVE BATTERY AND THAT SHOULD SOLVE THAT PROBLEM.

1. Install or connect the following:
   
   • Spring seat. Tighten the new upper strut retaining nut to 36 ft. lbs. (49 Nm).
     
2. Remove the strut from the vise and disassemble the securing nuts and bolt.
   
3. Rotate the upper support so the lowest bolt on the support aligns with the projection part of the lower spring.
   

1. Install or connect the following:
2. Strut and tighten the strut to body bolts to 59 ft. lbs. (80 Nm).
   

• Strut to the steering knuckle and tighten the bolts to 156 ft. lbs. (211 Nm).
  

To install:

1. Install the lower ball joint onto the steering knuckle and tighten nut to 90 ft. lbs. (123 Nm). Install new cotter pin.
   

Price seems a bit high...just looked up struts at NAPA and found the most expensive were about $225 each. allowing for really high labor charges for all work, I came out with about 1250 complete. If the techs are very slow, or the labor charge very high, price still seems high. 80k is really pushing it on lifespan on struts...they are probably dead. Any competent shop can do this work...I'd shop around a bit. Usually chain store shops like peppyboys and others are not good places to bring a high-line vehicle. Check with friends to see who is most satisfied with the shop they use.

I had the same problem - you need to replace the strut mounds - there was a recall on the mounds for the same problem.... my noice was very very bad - and once I did that it was all over, talk about a happy person...
good luck