My 1999 Mercedes C280 had an intermittent check engine light. So I needed an OBD to check the problem, how did it come about, I have to be honest I was very skeptical when I ordered this product. I didn't expect a $10 device to be so perfect for the job. The product arrived on time. I downloaded the free Troque app to my Android phone. Following the instructions, my phone was immediately connected to OBDII via Bluetooth. The Torque app is very easy to use. I was able to see the error code and also view the last saved code. Found out the problem is in the exhaust valve which needed cleaning. I was also able to reset the code. All functions have not yet been tested. Dynamic features like RPM, Boost, etc. are cool. The revs are very accurate and show exactly the same value as the car's rev counter, but there is a slight lag that is not instantaneous. I highly recommend this OBDII. At the price you can't go wrong
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