Re: 2008 Mariner remote start
Installation of remote starts aren't always plug and play. I'm not familiar with this one, but on other newer vehicles, the dealer might have to install it just to make sure it clears the security system protocols. If it's not installed correctly it could lock you out from starting the vehicle after trying to activate the remote start.
I had one installed on my Pontiac and it's a 2006. Dealer gave me a bit of a runaround so I went to a local shop and they couldn't get it to manipulate the security system. Who knows, the Mercury system just might be 'plug and play', but I'd still be cautious as I was told my Pontiacs system could easily be done by the owner in an hour. Ha.
It was almost as painful as getting my remote batteries replaced. I had both die out within a week of each other which the dealer had to reset to the vehicle security system - $$$.
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!