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Lemur BlueDriver OBD-II scan tool review:BlueDriver diagnoses engine problems, shows smog check readiness

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The Good Repair Reports generated by the Lemur BlueDriver not only interpret error codes, but suggest causes and fixes. The Smog Check feature can let you know if your car is likely to fail a smog test.

The Bad The BlueDriver app offers no help in understanding your engine's running data. A built-in VIN scanner would be a helpful addition.

The Bottom Line For its price, the BlueDriver is a convenient tool for those who want some ability to work on and understand modern engines.

7.0 Overall

The complexity of modern cars, with their computer-controlled fuel injection systems, spelled the end of the shade-tree mechanic. Unless, of course, the diagnostic tools used by professional mechanics become inexpensive enough and easy to understand for the average Joe.

That's the idea behind Lemur Monitors' BlueDriver OBD-II scan tool, which lets you check your car's engine performance, examine error codes, turn off a check engine light, and even get an idea if your car will pass its smog check.

Affordable OBD-II scan tools have been around for a while, but BlueDriver allows for deeper data and more portability. Instead of an integrated scan tool with a small, monochrome LCD, like the majority of models available, BlueDriver consists of an OBD-II dongle connecting to a smartphone through Bluetooth. The BlueDriver app allows for a large number of features and takes advantage of a smartphone's computing power and connectivity.

Some of the data shown by BlueDriver will be incomprehensible to the average car owner without the help of a site like Lemur Monitors includes features that make BlueDriver more generally useful, however, such as smog-check readiness and repair reports.

OBD-II plug

BlueDriver's black plastic casing measures 2.25 inches long and 1.75 inches wide (57 by 45 mm), large enough to accommodate the OBD-II plug on one end. This dongle will plug into a car's OBD-II port, which is usually placed under the dashboard on the driver's side. On my own 1999 BMW Z3 Coupe, however, the port sticks out in the passenger-side footwell. Lemur Monitors molds a convenient finger grip into the top of the BlueDriver, making it easy to insert and remove.

Note that OBD-II ports were mandated for 1996 model year cars and later, so the BlueDriver won't be much help on that '86 Plymouth Reliant in your driveway.

LemurMonitors BlueDriver
The BlueDriver app's Live view shows real-time diagnostics from your engine. Wayne Cunningham/CNET

The free BlueDriver app runs on iOS and Android devices. The home screen includes icons for the main functions, while a strip along the bottom offers a shortcut, labeled Live, to view the data stream from your engine. A secondary menu screen includes icons for the BlueDriver manual, customer service, and ordering the BlueDriver dongle.

To get started, I plugged the dongle into my car's OBD-II port, then opened my phone's settings and accepted the Bluetooth pairing. Launching the app, I chose the Vehicle Info icon and entered my car's VIN, which brought up detailed information about my car. The app also let me choose year, model, and make -- useful if I didn't have the VIN handy. It would be handy if the app offered a VIN scanner, using the phone's camera to recognize the VIN on the car.

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