Asking top dollar $70K for a truck that still has a check engine light / traction control light is the wrong vibe, people are going to question if it’s something bigger than a “quick cheap fix“ than you’re letting on. If it’s only $500, why didn’t it get fixed since you had two years to fix it? (This coming from a guy who had a permanent check engine light on my winter beater civic because it didn’t bother me). Handier people probably won’t care that much, but cuts down on the number of interested buyers. Always appreciate a transparent seller though, so take this as more advice on selling than the actual ease of repair or risk.