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Since your new to the Z I would suggest you bolster your tool box with a Code Scanner, you will save the cost of one the first time you need to use it. For a beginner I would reccomend a Creator 310+ or a Creator 410+ scanner, easy to use and will give you access to all the modules your likely to get codes for when things go wrong. Available on ebay and Amazon circa £50 + depending which one you go for.