An oil leak problem probably is the sign of a problem in your oil pressure or it could simply be a slow leak. The problem can cost anywhere from $100.00 to $400.00 for an oil pressure problem.
Coolant leak.
Leak detection pump.
Because the leak is high up in the tank.
YesYes
possible faulty leak detection pump
You have a leak that needs repaired.
i believe the heater core is leaking, a small pin hole leak can generate a lot of smell.
You don't. One, it is illegal. Two, It would cause a exhaust leak that if it got inside the vehicle would be poisonous to the driver and passengers.
Coolant level is probably low, Have it checked for an antifreeze leak.
Bad bearing? Leak onto engine component?
Trouble code P1494 means: Leak detection pump pressure switch or mechanical fault
Either the induction system has a leak (air cleaner housing, tubing, etc.) or you have a vacuum leak.