peugeot 307 - Depollution system oxygen sensor fault -
depollution system faulty indicator on means your vehicle's computer has determined that a component or system in your emission control system is not working properly.When the light comes on, one or more diagnostic trouble codes (DTC) are stored in the engine control module. These DTCs remain even if the light goes out. so, usually, I guess you get a tester tool to read out the fault code, and maybe clear them before you replace the oxygen sensor. As for which scan tool to get, it depends on your skills and your car's model and year. If you can do it by yourself, I suggest you get a trouble code reader, if not, just turn on technicans. good luck!