Buy Ford Taurus Oxygen Sensors

The Ford Taurus uses one or more oxygen sensors-also called O₂ sensors, lambda sensors, or air-fuel-ratio probes-to tell the engine computer if the fuel mix is rich or lean. A healthy sensor keeps fuel economy high, cuts tail-pipe pollution, and protects the catalytic converter. Most Taurus models built since 1996 carry four sensors (two Òupstream,Ó two ÒdownstreamÓ), and replacing a worn-out unit can boost mileage by up to 40 percent. (US EPA)

The sensor sits in the exhaust stream and produces a voltage that swings between lean (about 0.1 V) and rich (about 0.9 V). The engine control unit (ECU) adjusts injector pulse-width in real time so the air-fuel mixture stays near the ideal 14.7 : 1 ratio that lets a three-way catalytic converter scrub NOx, CO, and HC. (Wikipedia)
Bosch first released the automotive lambda sensor in 1976, making modern emissions control possible. (Bosch Global)

• Bank 1 Sensor 1 (B1S1): Front (firewall) side of the engine, before the catalytic converter.
• Bank 1 Sensor 2 (B1S2): Same bank, but behind the converter.
• Bank 2 Sensor 1 (B2S1) & Sensor 2 (B2S2): Mirror images on the radiator side for V-6 models.

A Ford technician notes the 2002 Taurus Òhas four O₂ sensors-two upstream and two downstream.Ó (JustAnswer)
RepairPal adds that various Taurus years may use two to five sensors depending on engine and trim. (RepairPal.com)

• Unheated sensors: 30 k-50 k miles.
• Heated sensors (most 1996-up Taurus models): Up to 100 k miles when fuel quality is good. (Wikipedia)
• Check sensors at every major tune-up or whenever the Check Engine lamp shows codes beginning with P013-P016 (oxygen circuit) or P0420/430 (catalytic efficiency). (Kbb.com)

• Rough idle, stalling, or misfire. (Cars.com)
• Drop in mpg or Òrotten-eggÓ exhaust smell.
• Failed smog test or code P0136 (B1S2 circuit fault). (Kbb.com)
• Sulfur-coated or sooty sensor tip on inspection.

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According to the U.S. Environmental Protection Agency, fixing a bad O₂ sensor can restore up to 40 % of lost fuel economy. See the agency's fuel-economy guide for details.
The sensor also lets the catalytic converter work at peak efficiency, slashing NOx, CO, and HC emissions. (Wikipedia)

• Always thread the new sensor in by hand first to avoid cross-threading.
• Torque: M18 sensors-26 - 33 ft-lb (finger-tight, then ½-¾ turn) per NGK's installation chart.
• Generic guidelines list 22 - 30 ft-lb for most Ford-style threads. (KEMSO)
• Use dielectric anti-seize only on the threads, away from the tip.

Unplug the battery before working near heated lambda sensors. Exhaust parts stay hot for 30 minutes after shutdown-wear gloves and eye protection.

1. Fix oil or coolant leaks quickly-contaminants shorten sensor life.
2. Avoid silicone-heavy sealants around the intake; fumes poison the ceramic cell. (Wikipedia)
3. Run high-quality fuel to reduce soot build-up and protect the catalyst downstream.

Healthy O₂ readings let the ECU protect the catalytic converter, spark plugs, and EGR system. Learn how converters clean exhaust in this overview of three-way catalysts.

A working oxygen sensor is a small part that delivers big rewards: smoother running, cleaner air, and more money left in your pocket thanks to better fuel efficiency. Regular checks and timely replacement keep your Ford Taurus-and its catalytic converter-healthy for the long haul.