Yes, the main relay is also known as the fuel pump relay. When one fails in can create a slue of different problems for the car such as turning the car off while driving.
The computer detected a malfunction, set a code, and went into limp mode.
The transmission computer has detected a malfunction. You need to have it checked for codes.
it could be the main assembly relay under the drivers kickpanel
The door lock relay is the culprit. where it is I have not a clue so far.
The transmission computer has detected a malfunction and set a code. You will need to have it checked for codes to know what to diagnose.
it may not be you ignition relay, but your alternator.
main relay
This is not the cause, this relay is to start the and run the compressor (Basically) and it will not cause the system to lower overnight.
main fuel relay going bad. Eventually car will cut off while driving.
It may be over heating,check out your rad hose. There are many things that can cause low power: weak fuel pump(check pressure), sensor malfunction ( codes ) ,charging system malfunction, transmission shifting issues, brakes dragging.
A malfunction has been detected - get it checked out
First thing to check is the fuel pump relay. IT could also be that big air clearner hose. If that is broken or cracked anywhere these it will cause over fuelling.