Worst fake Eco OBD2 fuel saver yet (with schematic)

As designs go, this has to be the laziest and cheapest fake engine tuner plug there is.
Most of these units try to look convincing by emulating data transfer with flickering LEDs, but this one has just one flashing LED with circuitry that hints that the designers didn't even know basic electronics.

Worse still, this unit manages to pass almost 20mA of current continuously to light its LEDs, that may not even be visible through the badly designed case. That current is significant for a vehicle that doesn't get used a lot.

These units pretend to interface with your cars control computer via the OBD (On Board Diagnostics) port normally used by mechanics to analyse vehicle faults. They claim that the unit learns your driving behaviour and fine tunes the engine settings for maximum efficiency and power. In reality while there are real units for very specific vehicles, these units just put on a light show and rely on the buyer to convince themselves that they feel a performance difference.

In some instances these units can have faults that actually interfere with your vehicles data networks and that can result in your car malfunctioning while the unit is plugged in.

Don't waste your money. If you really want to save fuel, try to adjust your driving style to avoid excessive acceleration and braking (hard braking is wasted energy), and avoid trying to accelerate uphill as that poses the highest strain on an engine.

On a plus note, the case could be useful for your own OBD projects to utilise the permanent 12V available at the socket.

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