Yes u still have to replace ur sensor to get rid of ur cel. But ur car not starting when its hot out is due to a worn main relay. Those sensors stated previously aren't very expensive. Replace the sensors stated as well as the main relay and you'll be good to go.

 

To be sure which sensors, long flashes are 10, small flashes are 1. A break in between means its going to the next code. If u figure out exactly the codes being put out, we can let u know what sensors need replacing for certain.

 

if u are having hot start problems, then yes start with the main relay, either replace or re solder the joints....then make sure u are reading the blinks for the codes correctly then troubleshoot properly !!!