Bully Dog WatchDog Economy Monitor review: Bully Dog WatchDog Economy Monitor

CNET Editors' Rating

3.5 stars Very good
  • Overall: 7.3
  • Design: 8.0
  • Features: 6.0
  • Performance: 8.0

Average User Rating

0.5 stars 2 user reviews
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The Good The Bully Dog WatchDog allows you to easily monitor your driving habits and manage fuel economy or observe up to four engine parameters normally hidden within the vehicle's computer. The unit's menus are easy to navigate and smartly organized. A diagnostics mode allows you to check and clear trouble codes, and a performance test mode tracks the vehicle's best quarter-mile and 0-100 kph times.

The Bad The WatchDog requires an HDMI cable and adapter to connect to the diagnostics port, which can be difficult to hide during daily operation. The price is a bit on the high side.

The Bottom Line During the course of our testing, the Bully Dog WatchDog proved to be alternately simple enough for a novice to use and complex enough for our car geek tastes. It'll help you boost your fuel economy within reasonable limits, but don't expect it to be an mpg magic bullet.

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Most new vehicles these days feature some sort of instant or average fuel economy meter. In many cases, there is also some sort of eco light that illuminates to let drivers know when they're driving efficiently. For older vehicles (and for owners who want more information beyond a simple, "Am I driving efficiently, yes/no?") there are the aftermarket diagnostics devices. These devices plug into the onboard diagnostics port that is present on most vehicles manufactured after 1996.

Of the examples of these devices that we've tested, the Bully Dog WatchDog is one of the best designed. Its control scheme is both easy to understand and to use at an arm's length; its interface is the easiest to read at a glance and use to navigate at highway speeds. But is it worth its $299 price tag? Well, that all depends on you.

Design
The WatchDog is available with a black or white shell, has about the same footprint as a business card (3.5 inches wide by just over 2 inches tall), and is about half an inch thick. The unit features a smallish, 2.25-inch color LCD. The display is not touch-sensitive, but is flanked by seven touch-sensitive pads on either side (five on the left, two on the right) with which the user interacts.

Along the unit's right edge is a Mini-USB port and a microSD card slot. On the unit's back is a slot for the included mounting arm and, oddly, an HDMI port.

The HDMI port isn't used for connecting to your HDTV, however. Instead, the WatchDog uses an included HDMI cable to connect to its OBD-II connection. The connector itself is a 1.75-inch-by-2.25-inch-0.75-inch-thick block of plastic and electronics that connects to the onboard diagnostics port. Along one side is the HDMI connection used by the WatchDog and a connection point for a power wire that must be routed to the vehicle's fuse box. (Our test vehicle, a 2011 Ford Fiesta, did not require this power and was able to draw sufficient power from the OBD-II bus.) Along the other side is a Micro-USB port, a smaller four-pin Micro-USB port for use with an optional auxiliary sensor, and a 2-amp blade-type mini fuse. On top of the connection is an on/off toggle that enables you to connect and disconnect quickly without physically removing the plug.


The WatchDog repurposes an HDMI connection and cable to connect to its OBD-II port reader.

Of its bulk, about 0.5 inch of the connector's height is the OBD-II plug itself, so the connection isn't as high-profile as it may seem at first. Additionally, most vehicles hide their OBD-II connection in the footwell or beneath the dashboard, so the black plastic wart will at least be out of sight for day-to-day use. However, the HDMI cable itself will not be, and unfortunately such a thick cable makes cable management in the car difficult.

Holding the WatchDog in place during motoring is a flexible windshield mount. This mount connects to the WatchDog using a slotted peg and connects to the windshield using a lever-actuated suction cup. We found that the suction cup wasn't exactly the strongest that we've tested, but the WatchDog itself weighs less than an ounce, so the mount proved sufficient during driving. Between the two mounting points is a flexible neck that can be bent into nearly any shape or angle that the user desires. The entire arm measures 8 inches from end to end, so there's plenty of room for positioning.

Use and performance
Note: Initially, we wanted to test the WatchDog with our normal test vehicle, a 2006 Chevrolet Aveo. However, during setup, we realized that the Aveo lacked the OBD-II protocol needed to communicate accurately with the WatchDog, despite being manufactured a decade after the ports became standard. As a result, we tested the WatchDog with a 2011 Ford Fiesta hatchback. You'll want to make sure that your vehicle is compatible with Bully Dog's diagnostic technology before you make your purchase or throw away your receipt.


During setup, we were prompted to input our vehicle's specs.

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Where to Buy See all prices

Bully Dog WatchDog Economy Monitor (white)

Part Number: 40400
Low Price: $299.99 See all prices