Engine light went on so i checked the code. 31 is mass airflow sensor. So i replaced the sensor. It ran good after the installation, but after a day it went back to the way it ran before the installation. The engine light N trac light are back on also. People are saying its the ECU. Wanting some opinions on the matter

 

always note the year of your car pls!

 

Sorry its a1994

 

Where did you get your sensor from? New or used? These are the type you can't clean.
Those connectors are prone to break with age and miles. Are you sure the connector is on tight and has a good connection? Did you clean it with electronics cleaner?

 

I got it used. But said it was tested to work.
Yeah everything is tight N i cleaned out both sides of the plug.

 

A past thread and there are other discussions on Code 31 that may be useful on other Club Lexus sections.

These from the LS area:
https://www.clublexus.com/forums/ls4...-ecu-good.html

https://www.clublexus.com/forums/mai...em-solved.html