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I'm following this guide: http://www.instructables.com/id/How-to-fix-your-check-engine-light/?ALLSTEPS

According to this website an OBD-II reader will work with my 53 Vauxall Zafira, but I want to be sure they are a universal standard. Will any reader do?

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Yes, OBD-II is an international standard that (almost) all car manufacturers use for vehicle diagnostics. Your car will have an OBD-II port on it somewhere for connecting an adapter to.

See this question for what to look for in an adapter.

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