Ford Oxygen Sensors

The oxygen sensors in your Ford, Lincoln, or Mercury vehicle play an important role when it comes to its performance. Also known as lambda sensors, they measure the oxygen levels in the vehicle's exhaust gases. That data is then sent to the engine control unit (ECU), which adjusts as needed to keep your engine running its best.

Your vehicle has at least two oxygen sensors, if not four. One is located in front of your catalytic converter (the upstream sensor), while the others can be found in the exhaust manifolds (downstream sensors). The upstream sensor monitors how efficiently your engine combusts the air-and-fuel mix. That information is relayed to the ECU, which calculates the optimal mix needed, The ECU also uses the readings from the downstream sensor(s), comparing them to the upstream sensor readings to ensure that they're consistent. If they don't match, you may see a diagnostic error code pop up.

How to Spot Oxygen Sensor Problems

If your oxygen sensors go bad, the ECU has to guess as to the ideal air-to-fuel ratio. That's not good. Signs of failure include:

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