Hi I have a 1998 Honda Civic Lx that had a p0420 code and causes the CELto come on, I recently had a p0135 and replaced the o2 sensor and then this code came up on my scanner 50 miles later. The scanner shows that that the EVAP system is "not ready" yet the cat says "ready". I've erased the code a couple times and each time the same thing keeps happening. What do I need to fix? Any help would be great