This is my first post -- I hope it helps!
Looking at your code, modify it as follows:
print("I have an Engine " . %{$car}->{'Engine'} . "\n");
print("I have " . %{$car}->{'Doors'} . " Doors\n");
print("The color is Colour " . %{$car}->{'Colour'} . "\n");
Don't forget the spaces as needed in the print command.
Good Luck,
Sagacity