The newer button starter C4 Picasso diesels do indeed take longer to start when the temperature drops below 3 degrees centigrade. The key operated ones seem to behave differently. I used to press and hold the button until I was told that you should press it briefly and release.

Bluetooth features on Citroen C4 Picasso 2. Let’s take a closer look at the features of bluetooth on Citroen C4 Picasso 2. The bluetooth as we have seen above has the main intent of transferring data between two devices. Nevertheless, its uses are quite limited. In fact, we will mainly use the bluetooth on car for:

Iv'e just bought a new (facelift) C4 Grand Picasso THP130/EAT6 Flair and very pleased with it except for one niggle. I can't get the aux input to work, just stays greyed out. Tried my Next-Base DVD player and earphone out from an i-pod classic result NOTHING.Both were playing so thought it would light up and play. The C4GP is a my Company Car and my phone connects every time via Bluetooth, no problems there. The signal is good, the reception is good and I can hear them loud and clear through the cars speaker system . however, they can hardly head me. They're telling that it sounds like I'm at the far end of a cave or the bottom of a tin can.
citroen c4 picasso bluetooth problems

Sometimes, Bluetooth connectivity issues can be resolved by a simple restart. Turn off both your smartphone and the infotainment system of your C4. Wait for a few seconds and then turn them back on. This process can help clear any temporary glitches that might be affecting the Bluetooth connection.

FAQ. FAQ #149. C4 Bluetooth default Passcode? I bought myself an 05 vtr+ coupe and want to pair my phone with the stereo. Does anyone know what the passcode is? I've tried the usual 0000 and 5555 etc but I keep getting the message ' pairing conditions not met'.
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citroen c4 picasso bluetooth problems