* Upstream Sensor (Bank 1, Sensor 1): This sensor is located in the exhaust manifold or very close to it, before the catalytic converter. It's the one closest to the engine. Bank 1 usually refers to the side of the engine with cylinder #1.
* Downstream Sensor (Bank 1, Sensor 2): This sensor is located after the catalytic converter in the exhaust system. It monitors the efficiency of the catalytic converter.
Some 2002 Mustangs, particularly those with multiple catalytic converters or different engine configurations, might have more than two oxygen sensors. However, the two described above are the most common.
To be absolutely sure, you should:
1. Consult your owner's manual: It will have diagrams showing the location of all sensors.
2. Use a repair manual specific to your Mustang's engine: These manuals usually have detailed diagrams and instructions.
3. Use an online automotive parts website: Input your vehicle's year, make, model, and engine, and search for "oxygen sensor." The diagrams showing sensor placement on the parts website can be helpful.
Remember to always exercise caution when working under the hood of a vehicle. The exhaust system gets very hot, so allow it to cool completely before attempting any work.
