The Tacklife OBD-II Bluetooth auto code scanner and diagnostic tool is down to $7.48 with code NC27Z935 on Amazon. Without the code, this OBD-II car code reader sells for around $15 and regularly stays at that price. We haven't seen it go on sale very often.

The diagnostic tool supports all OBD-II protocols and works on most vehicles sold in the U.S. since 1996. It retrieves both generic and car manufacturer-specific diagnostic trouble codes. Use third party apps like Torque Pro on Android to analyze the data from the scanner and turn that check engine light off.

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The tool streams data wirelessly via Bluetooth to your Android or Windows phone. It does not work with the Apple iPhone. You need a scanner that works with Wi-Fi to communicate with iOS smartphones, so look at this $20 Kobra OBD-II reader for Apple compatibility.

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