It’s the first search result on Amazon for “Fuel Saver” so it has to be good, right?

Gas prices are breaking records around the world so, naturally, people are looking for quick fixes. Search for “Fuel saver” on and the first result that pops up is this BNYKDYJ brand OBD2 Dual-Plate fuel saver with chip.

With a 3 out of 5 star rating, affordably priced at just $23.99, and for sale on the most popular commerce site on the internet, you’re probably wondering if this simple device really can save you as much as 15% on fuel.

If you’re familiar with my site, I’ve broken down why these types of devices almost never deliver on what they promise and are scams, plain and simple.

These seemingly cheap OBD2 fuel saver scam plugs mostly share a handful of redflags: they come from fairly new companies, they make dubious claims without any proof, they follow the same formula, and have questionable reviews.

Let’s see how the BNYKDYJ Dual-Plate Fuel Saver does.

The short and fairly new history of BNYKDYJ

BNYKDYJ’s OBD2 fuel saver dongle has been on sale for less than two years, and the company’s trademark is even newer.

According to their product page, this OBD2 fuel saver was first available for sale on Sept 17, 2020.

BNYKDYJ is a trademark owned by Ningxia Shengqianda Electronic CommerceCo., Ltd. Their trademark page claims they first used this trademark on April 22, 2021.

Among their trademark’s stated purpose, they claim to make “Engine Parts, namely, electronic fuel injection modules” which, I presume, this “Dual Plate Fuel Saver with Chip” is classified as.

Claims not backed up by data

According to BNYKDYJ’s product page,

“Green (gasoline) and blue (diesel) code readers can save cars about 15% of fuel; yellow (gasoline) and red (diesel) code readers power the car The booster can increase the power of the car by about 35% and the torque by about 25%.”

The infographic linked here illustrates this claim.

This claim is both vague and suggests that it applies to all cars regardless of year, make, and specific model.

It’s specific enough that, if the FTC decided to prosecute this Amazon seller, like they’ve done in the past, BNYKDYJ would have to provide proof that these aren’t deceptive claims.

There is also no data backing up fuel saving and power gains claims. A simple, non-biased and standardized back-to-back test with and without the dual plate fuel saver and/or some power pulls with the corresponding dyno sheets would suffice.

This Amazon product provides neither.

Follows the same formula of other generic OBD2 fuel saver devices.

Not only does this BNYKDYJ Fuel Saver use the exact same green OBD2 fuel dongle so easily found on Chinese Wholesaler sites like and, they use almost all the generic colors available.

As you can see, these OBD2 dongles are available from wholesalers for as little as $3 a piece. Click here to see what I mean.

An OBD2 Fuel Saver for sale by AliExpress
They come in yellow, red, green, and blue. Look familiar?

BNYKDYJ also provides a video showing the inner workings of the dual plate fuel saver as proof there’s some real deal computing power going down.

Here’s a screenshot of the inner workings of the BNYKYDJ Dual plate fuel saver and an OBD2 performance chip opened up by Youtuber BigCliveDotCom.

Notice anything? They use the exact same Micropchip #PIC16F59. The circuit board assembly also looks surprisingly similar.

BigClive’s analysis, one I agree with, states, “There’s nothing on this module here that can actually transmit data back into the car to the ECU. All it (this OBD2 dongle) can do is look at what’s happening and that is in fact all these do.

“They monitor the lines, they have these resistors as protection and to prevent this from jamming the CAN BUS network on your car.”

This independent analysis was corroborated by EEVBlog who, upon dissecting a similar OBD2 fuel saver, concluded and commented that, “The CAN pins are not connected at all, as there is silkscreen under the pins and no pad or solder at all. In addition to the 10K resistors being too high to drive a CAN bus, it physically can’t even drive it because the CAN bus is not connected. Same for the K-Line and L-Line.”

Simply put, these OBD2 fuel savers cannot transmit any data back to the car’s ECU. If that’s the case, there’s no “on the fly” programming and re-mapping that can be done.

What do the reviews say?

All reviews for this BNYKDYJ Dual Plate Fuel Saver can be found here.

The top review that 191 people found helpful is from William G McClain on March 29,2021 who said,

“Bought before I researched. Found out this is a scam. Waste of money.”

Another Top review from Saint Leo from June 19,2021 says,

“Terrible. My mileage went from 18 mpg to 12.8 mpg. I removed it after a few days and my mpg went back up. About 4 hours later, my radio in my 2010 Dodge Grand Caravan quit working. Sorry I ever tried it. I bought the Van new in 2009 and had no problems just wanted to increase my mpg now I’ve got to spend 5 to 8 hundred dollars to replace the radio with an aftermarket that won’t do all that my original one would do. Very disappointed. Battery drains overnight now since I removed the device. Now having to take to dealer at $150 per hr for diagnosis.”

There are actually four reviews stating this device drained their battery. If you watched EEVBlog’s video on a similar device, he actually finds out that these dongles “draw a fair amount (of power) about 50 milliamps.”

This reviewer provided fuel receipts showing no marked change.

And this reviewer received a package with an OBD2 device that looks a lot similar to the ones you can buy for $3 on


Based on how new this fuel saver is, the lack of information on the company, how similar it is to devices that others proved don’t do anything, and the worrying amount of reviews saying how this device did nothing and, in fact, drained their batteries, I would not buy this BNYKDYJ fuel saver.

Hopefully, you come to a similar conclusion.


  1. I would caution against it! My 2002 Ford Ranger went from 17mpg down to 9 mpg and after removing it I can not get any better than 11 mpg! I also experienced the drain on my battery! I tried emailing them to find out what I can do to reverse the effect it had on my truck as well as a refund. No response back! A costly waste of money beyond the price of the product! Not sure which ones are the real deal…stay clear

    • Sorry to hear that. I’d recommend disconnecting the negative cable on your battery to reset your ECU. Beyond a simple tune-up like checking all your tire pressures, a new air filter & plugs, I’d also recommend running a fuel tank of Chevron with Techron and throwing in a small bottle of Lucas Fuel Treatment. What I recommend won’t make things worse, that’s for sure, and hopefully you’ll see your MPGs return.


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