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Where the O2 sensors located for a 2003 lincoln navigator

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O2 sensors are always in the exhaust of the engine. it measures the exhaust gas to help regulate fuel delivery. the lincoln probably has two banks of sensors. one on each side of the motor located close to the engine in the exhaust pipes. looks a little like a spark plug sticking out of the pipe and will have an electrical line going less than a foot to a connector. there can also be one after the catalytic convertor. same look there too. hope this helps and good luck

Posted on May 14, 2010


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I have a 2003 lincoln navigator. when i start it in the morning the engine get acceleration and deacceleration, it does this for maybe a minute , then runns perfect. the computer shows some codes

Go to an Autozone, Advance auto, or Oreilys for a free Code scan. This will tell you some or all of the problems. Usually this symptom is a result of a bad O2 sensor changing the fuel mix (floating)from lean to rich or the temperature sensor messing with the "cold start sequence".

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There is a problem with the catalytic converter. P0420 sets when the downstream o2 sensor is either reading higher than expected or reading simular to the upstream O2 sensor. Either way it is usually the catalytic converter that is the source of the problem and rarely the downstream O2 sensor.

The Catalytic converter is located in the exhaust system under the car. Catalytic converters from either the dealer or a quality direct fit part from a reputable manufacturer are recommended. Cheap cats lead to lots of problems!

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If you have a single catalytic converter than there will be one O2 sensor (downstream) located after the catalytic converter. If there are two cats than there could be two O2 sensors behind each cat. The job of these two sensors is to monitor the catalytic converters efficiency.

Oct 25, 2010 | 2003 Lincoln Navigator

1 Answer

1998 lincoln navigator code131 and 133

It means you need to replace your O2 sensor, bank 1. You can buy a new sensor at any auto parts store, usually around $20. The bank 1 means it is the first O2 sensor in the system. To find it, start at you exhaust manifod, and search back along the piping. The first O2 sensor you find is the one that is failing. A wrench or socket can be used to removed the old and install the new.

Good Luck!!

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1 Answer

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