I bought this to diagnose some problems on the E-320 MB. I was scratching my head over some of the symptoms and since it was a Benz no cheap eBay code reader would work. I was able to diagnose the crankshaft sensor and the faulty oxygen sensor. With the parts I need to order. I feel it was a MUCH BETTER investment than paying Star for 2 hours of diagnostic time in a theft. If you are DIY, you should definitely buy a good OBD II.
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