I just found issue, and solution. At engine rear center has bolt on EGR valve. That valve can be moving helping with a vacuum membrane, that membrane was worn out, so if screwed a small bolt into that vacuum line end, to seal vacuum line, and puch back line to EGR vacuum line connector. After that point my P2598 code goes avay forever, i driven my van cca 4-5000 miles, but never get any error code or any isse. I started it in really winter conditions, in -8°C, but runs fine after every starting, checked with code reader, don't find any error code.