On a Mercury Mountaineer :
V6
firewall
3 - 6
2 - 5
1 - 4
front of vehicle
--------------------------
V8
firewall
4 - 8
3 - 7
2 - 6
1 - 5
front of vehicle
V6 firewall 3 - 6 2 - 5 1 - 4 front of Mercury Mountaineer ============================= V8 firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Mercury Mountaineer
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Mercury Mountaineer
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Mercury Mountaineer ( V8 )
On a 1999 Mercury Mountaineer , 4.0 liter V6 engine : firewall 3 - 6 2 - 5 1 - 4 front of vehicle
On a 2005 Mercury Mountaineer , 4.6 liter V8 engine : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
FIREWALL 4 - 8 3 - 7 2 - 6 1 - 5 FRONT
On a 2003 Mercury Mountaineer , 4.6 litre V8 engine : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
On a 1999 Mercury Mountaineer , 5.0 liter V8 engine : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
Drivers side, last cylinder towards the rear.
1997 was the first year of the Mercury Mountaineer and the only engine available was the 5 liter over head valve ( OHV ) design with ( 2 ) valves per engine cylinder
The oxygen sensor for bank 1 sensor 1 for a 2000 mercury mountaineer is on the cylinder #1 side.
On a 2005 Mercury Mountaineer : V6 engine firewall 3 - 6 2 - 5 1 - 4 front of vehicle ---------------------------------------------- V8 engine firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle