I have a 98 Accord 4cyl EXL w/129000 miles. the Check engine light and the other little yellow light is on. I have checked the manual and both lights relate to emissions it seems - one is the catalytic converter and the other is a emission control module. performance does not seem to be affected now. my questions are : 1. should i trust the manual or bring it to a mechanic 2. how much on average are the fixes for these problems - assuming the manual is correct. thanks in advance. roger