Hi, I have had my 2.4 surf for just a few weeks and put some Redex stuff in and now if I rev the engine black smoke appears - is this meant to happen? No sign of any smoke before treatment. Also, the rear fog light has stopped working - it seems to be connected to the radio backlight somehow which has also stopped working. I have checked all the fuses I could find (drivers right side and under the bonnet) but they all look fine.

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