2pcs Upstream Downstream O2 Oxygen Sensor for 2001-2010 Ford Explorer 4.0L

Fitment:

• Ford | Crown Victoria | 1998~1999 | 4.6L
• Ford | E-150 | 2002~2003 | 4.2L
• Ford | E-150 Econoline | 1999~2001 | 4.2L
• Ford | E-150 Econoline Club Wagon | 1999~2001 | 4.2L
• Ford | E-250 Econoline | 1999~2001 | 4.2L/5.4L
• Ford | E-350 Super Duty | 2008~2010 | 6.8L
• Ford | E-450 Super Duty | 2008~2010 | 6.8L
• Ford | Escape | 2007~2009 | 3.0L
• Ford | Expedition | 1999~2006 | 4.6L/5.4L
• Ford | Explorer | 2001~2004 | 4.0L
• Ford | Explorer Sport Trac | 2007~2010 | 4.0L/4.6L
• Ford | F-150 | 1999~2003 | 4.2L/4.6L/5.4L
• Ford | F-150 Heritage | 2004 | 4.2L/4.6L
• Ford | F-250 | 1999 | 4.6L/5.4L
• Ford | F-250 Super Duty | 2008~2010 | 6.8L
• Ford | F-350 Super Duty | 2008~2010 | 5.4L/6.8L
• Ford | F-450 Super Duty | 2008~2010 | 6.8L
• Ford | F-550 Super Duty | 2008~2010 | 6.8L
• Ford | Fusion | 2006~2009 | 3.0L
• Ford | Ranger | 2004~2011 | 2.3L/3.0L
• Ford | Thunderbird | 1996~1997 | 3.8L
• Jaguar | S-Type | 2000 | 3.0L
• Lincoln | LS | 2000~2003 | 3.0L/3.9L
• Lincoln | Navigator | 1999~2006 | 5.4L
• Lincoln | Town Car | 1998~1999 | 4.6L
• Lincoln | Zephyr | 2006 | 3.0L
• Mazda | Tribute | 2008~2009 | 3.0L
• Mercury | Cougar | 1996~1997 | 3.8L
• Mercury | Grand Marquis | 1998 | 4.6L
• Mercury | Mariner | 2007~2009 | 3.0L
• Mercury | Milan | 2006~2009 | 3.0L
• Mercury | Mountaineer | 2004~2010 | 4.0L/4.6L

How do I know the O2 sensor is good or not

Check engine light on

A reduction in fuel economy.

Your catalytic converter fails unexpectedly

Exhaust emissions reach undesirable levels.