I think my berks set of the CEL light in very cold weather - reset in warm weather and all is fine, then when it drops under 2-3 degrees, it comes back. My logic was that cold dense air allows more fuel to the mix, therfore runs rich...so emissions go up, tripping the CEL. Is this similar to what others have found?
Called Nissan to ask them to read the fault code for me, to be on the safe side, but they want to charge me £50 for the privilege. Is this standard Nissan practice?