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Diagnostics?

Save money it says £38.99 for a diy vehicle diagnostic unit.

How good/accurate are these things compared to the real ones at the garage.

Many thanks.
Bob, September 2013
Elm327 plug in module is a good cheap diagnostic tool which can run on pc or phone.very cheap on ebay

Steve, September 2013
They are usually ok for getting/deleting fault codes,you get what you pay for,you may find it won`t access some motors but be fine with others,some laptops/readers are thousands of pounds,hence a charge for getting plugged in at a garage.

cdc, September 2013