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207 1.6 Turbo lambda sensors Reply with quote
Our 207s 1.6T ((meaning GT/150thp/RC/GTi-175 ) have two lambda sensors.
One on the downpipe and another one after the cat, in the lower section of the downpipe.
For the first generation of 207s, with the first MED17.4 ECU (with a tc1796 microprocessor), the front lambda sensor is a wideband lambda sensor. Second generation 207s MED17.4 (with tc1766) mostly have a narrowband sensor instead of the wideband.
The second lambda sensor is a narrowband lambda, and it is there only to check the catalyst for malfunction.
From the ECU's point of view, the front sensor checks and corrects the Air/Fuel ratio. If it gets leaner than desired, makes it richer. If it is richer, than is leans it out.
Wideband lambda sensors have a wider usable range in their measurements and a much better sampling rate than the narrowband. They are the ones most suitable for turbo cars, but they cost too much compared to narrowband sensors (that is why Peugeot got rid of them, once they had made sure their cars did not need them).
Wideband sensors are always used by tuners. Checking Air/Fuel ration is the only way to tell if something terribly wrong is happening or is about to happen to your engine.
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