Who says spiders are harmless? If you own a 2009 or 2010 Mazda6 sedan you're probably not going to want to watch Arachnophobia any time soon. According to Mazda, a certain type of spider (the yellow sac) may weave a web in the evaporative canister vent line (part of the emission control system), causing a restriction in the line and an excessively...

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