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1996 Lexus LS400 with 1UZ-FE. Car when cold starts just fine and can drive around town, even trips less than an hour and it has no issues. Drive it for about 2 or 3 hours on the Highway, then stop and turn it off and it will not start again. It will crank and at the first turn of the key it...

Replaced the Crank Angle Sensor as it is a cheap part and since it is 24 years old why not replace it. Recapped the ECM because it also is 24 years old and the caps were definitely needing replacing. Tried MAF cleaner and got rid of Code 24 but still have Code 31, and now have ECT Power fault...

Code 24 is Intake Air Temp and code 31 is Airflow Metre, yet to try some Aerostart.

Car was running fine, then next day it will crank but wont fire. Diagnostics returns codes 24 and 31. I have replaced the crank angle sensor and recapped the ECM. I am now at a loss as to what do do next and what I can test to see if there is a sensor causing the no start issue.