You may need to clean the sensors off. They may have a build up and giving a false read. The only way to really know is do a scan and datalog to see what's going on. After you get a new air filter in, disconnect the battery for 10 minutes and reset the ECU, clean the sensors, and then see if you still have an issue. IF you do, then I would recommend you take it in and find out what is going on. Could be the MAF-IAT, could be exhaust valve leak, could be bad spark plugs, on and on and on.
Malfunction Indicator Lamp (check Engine Light)
in 01 - 06 Lexus IS300
Posted
Where are the sensors located?
Thanks