Upstream for 2006-2011 Buick Lucerne 4.6L O2 02 Oxygen Sensor Fits 234-4337

2X for 99-06 Mercury Grand Marquis 4.6L Oxygen 02 o2 Sensor Upstream Downstream

Upstream for 2006-2011 Mercury Grand Marquis 4.6L O2 Oxygen Sensor Fits 234-4373

2X Oxygen Sensor O2 02 Upstream+Downstream For 06-09 Mercury Grand Marquis 4.6L

Upstream for 1999-2001 Mercury Mountaineer 5.0L O2 Oxygen Sensor Fits 234-4403

Upstream Front Oxygen 02 Sensor 1 For 2002-2010 Mercury Mountaineer 4-Door 4.6L

2X for 99-06 Mercury Grand Marquis 4.6L Oxygen 02 o2 Sensor Upstream Downstream