Yes but I am not sure that the exhaust system is without leaks.thefunkyboy a écrit :I don't think it is so important with a benzin car. The cold has more impact on a diesel car, for sure.
Yes, you need a CO meter. In France, it is also hard to find but to succeed, you need to find a small enterprise
Could there be another cause? I want first to resolve every possible problem and then go to a CO meter.
And does anyone know what is the correct CO value? I found somewhere 1.5% +- 0.5