Sensor. Oxygen. HEGO. Ft. Snsr.
From 05/01/06. Oxygen Sensor.

Oxygen Sensor

Fits Mountaineer (1999 - 2001)

3.0 LITER. 4.0 LITER. 5.0 LITER. 6.8 LITER, 2009-14, from 9/23/08. 6.8 LITER, 2009-14, to 9/22/08. E150-350 Vans; 6.8L; Front; From 9/23/08; Left. E150-350 Vans; 6.8L; Front; To 9/23/08. Explorer, Mountaineer; 4.0L; SOHC; w/Sport, Sport Trac; Front. Explorer, Mountaineer; 5.0L; Right. Ranger; 3.0L. Ranger; 3.0L; Front; Left. Ranger; 4.0L; All. Ranger; 4.0L; Front.
Oxygen Sensor - Repair or Replace
A failed Oxygen Sensor will often have no noticeable symptoms beyond a check engine light, but it does cause your Mercury Mountaineer to operate inefficiently and produce higher emissions. Our technicians have access to manufacturer-approved repair processes and Mercury genuine parts.