show3g

I was driving my 1993 lexus gs300 the other day and noticed that the car was acting lke it was losing power. Before i could get home the check engine light came on. I checked the codes and got 21 and 24. I really dont know what to look at for these codes even though I look them up already.Code 21 says Main OS2 and heater signal. Code 24 says IAT sensor signal. I did notice that I had steam coming from under the hood when I parked. I checked but I couldn't see where it coolant was leaking from since this is what I thought was the cause of the steam. It did look like it was coming from the the back firewall somewhere near the drivers side. I would appreciate any help you guys can give a newbe on the foroum with this issue. Going out tomorrow to check and see if I can find that leak. Please Help!

RY2K

I got code 21 and 71 on my car, and everything is original. I am going to change the 02 sensor and see if I get better than 14mpg.
21 is your post cat sensor the other 2 sensors before the cat are air fuel.

code 24 is the vehicle speed sensor error (open circuit or no activity)
I don't think that is related to your steam issue, but maybe lack of power
I can ask a master tech at my job about the code.
I just got my 93 gs in october so I'm new to this as well but I work at a toyota dealer so I can get help.

How many miles are on your car?

show3g

I replaced the O2 sensor before the ca and all my codes are gone. Car is finally running like it should be. Havent check the gas mileage yet but hopefully that goes up too.

RY2K

thats good
how much was the O2 sensor

slammd_gs3

Check your heater hoses they are one of the prime problems with overheating .They always burst.

show3g

A friend got the sensor out the junk yard for me. The thing looks brand new so it could've been in the car that long. Lucky me!

RY2K

thats whats up
my friend is giving me one from his SC