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If the car is running fine and the fuel mileage has not changed it is safe to assume that perhaps your sensor is fubar. If it bothers you a lot just disconnect it.
I had the same problem.when I used my main key my car wouldn't start and I got the message "anti theft
faulty". The key and the remote still unlocks and locks the doors and turns the lights
on/off but it just wouldn't start my car. I was able to start my C3 by using the spare key. The main key is still faulty and if used brings up the same message.
We had this with our grand picasso all the warning lights on then car went into limp mode replaced two lambda sensor as this is what citroen thought it was in the end coolant sensor was leaking up wire back to ecu making all kinds of lights come on as it malfunctioned in the end new ecu cost over thousand pounds.
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