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Not too familiar with Peugeot but every car I've worked on has a switch that's actuated by the brake pedal. look up underneath the dash near the brake pedal pivot point with a flashlight you should see a switch that is actuated when you push the brake. you may have a bad switch or wire, easy to check with a volt/ohm meter. it may even be misaligned. This can can also stop your shifter from moving out of park. If your brake lights don't come on one of the above is your problem. Hope this helps.
If the thermostat is stuck open or the engine temp sensor is bad, the cpu will send extra fuel til the engine gets warm. Very much like the choke sticking on a car with a carburetor.
Hope this helps. Robert
If you drive your car more likely for short distances then the regenerating process couldn't be started to clean the cloged particulate filter and finally your car's ecu show you a antipollution fault. Drive your car to a motorway or dual carriage way.
The temperature meter should be showing above 70°C when you begin with this process. If this is the case, slow down place 3rd gear and drive at 3000-3500 rev /min to let the ecu to kick the regeneration process. Keep driving car 15 minutes in this state will be enough to solve this problem.
Most likely the ECU (Engine Computer Unit) is responding to some duff sensor / loose cable / whatever ..
All modern engines have more sensors than you can shake a stick at, some positioned in the most inaccessible places, that can cause the most obscure problems imaginable (remember the Oxygen Sensor in the Exhaust manifold that was 'poisioned' by some dufff supermarket petrol ??)
It's a Peugeot garage computerised diagnostics job I'm afraid...