SKU: 86690294300

AEM’s X-Series Wideband UEGO Air/Fuel Ratio Sensor Controller Gauge

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Description

AEM’s X-Series Wideband UEGO Air/Fuel Ratio Sensor Controller GaugeFree shipping with in the lower 48 states. SKU: 30 0300 AEMs X Series Wideband UEGO Air Fuel Ratio Sensor Controller Gauges are built upon unique, patented 100% Digital technology (Patent 9,575,030) that makes them the fastest responding wideband air fuel ratio controllers in independent testing*. The X Series Wideband UEGO AFR Sensor Controller Gauge (PN 30 0300) measures 2 1 16th inch (52mm) in diameter and features a modern, visually striking

Free shipping with in the lower 48 states.

SKU: 30-0300

AEM’s X-Series Wideband UEGO Air/Fuel Ratio Sensor Controller Gauges are built upon unique, patented 100% Digital technology (Patent 9,575,030) that makes them the fastest responding wideband air/fuel ratio controllers in independent testing*.

The X-Series Wideband UEGO AFR Sensor Controller Gauge (PN 30-0300) measures 2 1/16th-inch (52mm) in diameter and features a modern, visually striking faceplate and new seven-segment center display that is 87% larger than the 30-4110 AEM Wideband Gauge’s center display. This creates the perception of a larger overall gauge, but in a common 52mm size for easy mounting. Its slim depth (less than one inch overall) and ultra-slim cup depth of .200-inches dramatically increases its application base and potential mounting locations.

The X-Series Wideband UEGO AFR Gauge has a user configurable display via buttons on the gauge face that allows you to change AFR values for different fuels, Lambda or O2%, change the center display to three or four digits, perform a free-air calibration if desired as the sensor ages, and change the CAN message ID when linking multiple X-Series Inline Controllers or X-Series Controller Gauges. A black bezel and black dual-faced faceplate for air/fuel and Lambda are included, and an optional silver bezel with white dual-faced air/fuel and Lambda faceplate is available (PN 30-0300-ACC, sold separately). An Auto Dimming feature is included. Locking connectors ensure a positive connection between the harnesses and gauge and a new single board design adds to the new gauge’s durability.

The gauge includes a 0-5v and RS232 Serial Port output for feedback control and data logging, and an AEMnet (CANbus) output for data logging. AEMnet allows additional X-Series Wideband Controllers to be daisy chained together (up to 16 cylinders) for recording AFR in multiple cylinders. It supports vehicle/system voltages up to 16V, and can be used on EFI or carbureted applications, and dynamometers in applications using gasoline, methanol, ethanol, Diesel, propane, and CNG.

X-DIGITAL TECHNOLOGY
X-Digital wideband technology gives these controllers the ability to read and report values that other controllers do not, which can deliver more optimized engine tuning and a safer overall operating condition. The controller’s high-speed digital implementation ensures no loss of signal fidelity and full transient response, making it able to identify the slightest fluctuations in AFR and output them in full value.

WHY RESPONSE TIME MATTERS
Faster response time improves wideband feedback control, and can provide a safer, more powerful and accurate tune. AEM’s Wideband Controllers with X-Digital technology can reduce deadtime and improve the performance of your vehicle through more accurate AFR tuning. Deadtime is the delay between when exhaust gas composition changes and when that change is reported by the O2 sensor. While flow of exhaust gases (transport delay) can affect deadtime, it is not the only source. Often, the sensing elements response to the gas is the largest contributor to deadtime when an engine is in high RPM under load.

When tuning an engine using wideband AFR feedback control on an inertia dyno, deadtime affects the data you are looking at because it is reported in a different operating location than when it actually occurred. This means with long deadtimes, whatever changes you make to the base fueling will likely be in the wrong location. This can be particularly dangerous to high compression and high-boost forced induction vehicles, and EFI systems that use feedback control to auto-tune.

Reducing deadtime improves wideband feedback control, and can provide a safer, more powerful and accurate tune. AEM’s Wideband Controllers with X-Series digital technology can reduce deadtime and improve the performance of your vehicle through more accurate AFR tuning.

FACTORY CALIBRATION RESISTOR OR FREE-AIR CAL, IT’S YOUR CHOICE!
The X-Series Wideband Gauge and X-Series Inline Controller support the popular Bosch 4.9LSU sensor and can utilize both the factory calibration resistor and free-air calibration methods**. This allows users to take advantage of the precise factory resistor calibration when a sensor is new but then allows for free-air calibrations if the user desires when the sensor ages. It’s the perfect marriage of simplicity and accuracy!

WHAT IS A WIDEBAND UEGO AIR/FUEL CONTROLLER?
AEM's Wideband UEGO (Universal Exhaust Gas Oxygen, pronounced “You-Way-Go”) Controllers are powerful, cost-effective tuning tools that allow users to accurately monitor the Air/Fuel Ratio (AFR) of their engine.

WHY USE A WIDEBAND AIR/FUEL CONTROLLER?
Accurate AFR data is critical when tuning an engine. Running rich (very low air/fuel ratio, excessive fuel) can cause a loss in power, while running too lean (very high air/fuel ratio, not enough fuel) may result in serious engine damage. Using a wideband air/fuel controller during the tuning process allows you to monitor AFR and adjust tuning parameters to optimize them for maximum power and efficiency. AEM has a comprehensive line of highly accurate, reliable wideband air/fuel controllers that can help ensure your vehicle is optimally tuned.

CAN I CHANGE THE AEM UEGO SENSOR’S CONNECTOR?
No. There is a laser-etched, calibrated resistor in the sensor’s connector body. This resistor is specifically created for the exact sensor that it is attached to. Modifying this will invalidate the sensor’s output.

* Independently tested at 360° Product Testing (results reported on August 31st, 2015) against 17 competitors wideband UEGO Air/Fuel Controllers. AEM X-Series Inline with Bosch 4.9LSU wideband sensor and AEM X-Series Wideband UEGO AFR Gauge with Bosch 4.9LSU sensor recorded the fastest response times.
** Wideband UEGO sensors are wear items and their lifespan is determined by many factors including contamination from leaded fuels, automotive fluids, particulates, mechanical or thermal shock and from being unheated and exposed to the exhaust stream. Free-air calibration may correct drift as a sensor ages, but it is recommended that they are replaced as part of your vehicle’s maintenance program. When performing free-air calibration, please follow the procedure outlined in the instruction manual.


X-SERIES WIDEBAND UEGO CONTROLLER FEATURES:

  • X-Series Wideband UEGO AFR Controller Gauge were fastest responding wideband air/fuel ratio controllers in an independent test vs. 17 competitors wideband AFR controllers
  • Patented X-Digital wideband technology (Patent 9,575,030)
  • Includes Bosch 4.9LSU wideband UEGO sensor
  • Factory calibrated resistor does not require free-air calibration, but technology allows for free-air calibration as sensor ages if user desires
  • Compatible with vehicle/system voltages up to 16V
  • 0-5V & RS232 output for data logging and feedback control, AEMnet (CANbus) for data logging and daisy-chaining multiple controllers up to 16 cylinders
  • Can display AFR values in hundredths of %
  • 52mm gauge diameter and slim 0.825” gauge depth
  • Gauge cup depth only .200” deep!
  • Auto dimming feature
  • User configurable display via buttons on the gauge face for changing AFR values, Lambda and O2%, and 3- or 4-digit display
  • Black bezel and black dual faced faceplate included (gauge only, silver bezel/white gauge option sold separately, PN 30-0300-ACC)
  • Locking connectors

AFR VALUE RANGE BY FUEL TYPES:

  • Display Gasoline values from 8.0:1 to 20.0:1 AFR
  • Display Lambda values from .55 to 2.00
  • 0-5V Output Gasoline values from 8.5:1 to 18.0:1 AFR
  • CANbus Output Gasoline values from 8.0:1 to 20.0:1 AFR
  • CANbus Output Lambda values from .55 to 2.00
  • 0-5V Output Lambda values from .58 to 1.23
  • 0-5V Output E85 values from 5.7:1 to 12.0:1 AFR
  • 0-5V Output Ethanol values from 5.2:1 to 11.0:1 AFR
  • 0-5V Output Methanol values from 3.75:1 to 8.0:1 AFR

 

Shipping only $7.99 in the lower 48 states.

ecs 8-14-25


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SKU: 86690294300

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4.8 ★★★★★
Based on 619 reviews
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Verified Purchase
C. G.
Omaha, US
★★★★★ 5
Great investment! It'll save your floors and help train your pup by giving him/her a specific area to pee/potty in the house!!
Color: Blue, Size: 17" x 23", Color: Blue, Size: 17" x 23"
Though my pup sometimes like to pee right at the edge of this puppy pad holder, when he does, he usually just hits the lip of holder. He's a beagle/dachshund mix, and will probably end up around 20lb - he's around 15-ishlb now - so not a tiny dog, but is still a small dog. And with him being "not" tiny/toy, and him being a male, he tends to not aim so well sometimes when he uses it. This made using the PP holder a learning curve for me. I started out using the regular size pads in it , which fit amazing well; however, with Morty's - ahem! - mishaps with aiming, I tried doubling-up on the training pads - would put two of the reg size pads on the holder - and that left just enough pad "hanging" outside of the holder to meet Morty's mishaps in aiming. I was even able to still fasten the holder through the pad, which is awesome! However, using double to pads to cure Mort's lack of ability to aim for the center every time was costly, so I decided to shop around to see if I could find a solution to our aiming whoes. That's when I stumbled upon these pads at Walmart for just under $10 before tax, but they are available to purchase here at Amazon, & it occurred to me that perhaps one XL pad would give Morty that extra allowance he needed, and it could be more affordable to me - it worked! . These particular pads have been working out wonderfully because I continue to use just one pad and still get the overage protection - I'm pretty sure Morty intentionally pees on the edge sometimes - but since they're quite absorbent, it's very rare that he misses so much that he pees "through the pad." [The time he pees through the pad are the times he literally barely even hits the holder/pad at all because like I said, I'm pretty sure he aims for the edge on purpose most of the time.] Since Morty is a beagle/dachshund mix, he is a scent hound, which means that I can never just "let him outside" - I always walk him outside with a leash - because scent hounds follow their noses [pretty sure his nose is more Beagle than Dachshund lol]. And with it being extremely hot out now, I allow him to pee indoors at least 50% of the time; I am absolutely thrilled that he has taken to his wee-wee pad like a pro. All and all I'm very satisfied with this purchase because it has allowed us to have a clearly defined, and mostly contained space within out home for our pup Morty, to go potty in the house, and without ruining our hard floors. Moreover, since the holder itself is plastic, cleaning it up is a breeze! I just spray a bit of Clorox Clean-up on the holder, wipe it and voilà - odor-free home! As an aside; the holder mentions being skid proof, and though I don't doubt the validity in that claim since the feet, which are on the four corners, do have rubber on the bottom, Morty is still a 7-month-old puppy, and sometimes, he can be a bit ornery and play with his pee-pad - which is always fastened inside the holder. And that subsequently allows him to move the holder from it's original spot because he "pulls" it since he's trying to "pull" the pee-pad off. Also, when my daughter and her friends play fetch with him, sometimes they'll throw his tow toward the same area that his holder sits. When that happens, he tends to run across the pad/pad holder and cause it to move. I'm attaching a video to illustrate what I mean. On this particular day Morty was playing by himself with an empty two liter bottle - he loves bottles! On this occasion, his pad/holder is not in it's normal spot - he's actually moved it into the kitchen. Toward the end you can here him baying out the door at someone/thing. I believe it may have been the neighbor lol :) But since the times that Morty is able to move the holder are during times in which his doing it intentionally, I still wouldn't dock it for "not" being skid proof because it clearly is. I just wanted to point this out in case you furry family member is anything like mine, and is full of energy - I don't think there much of anything in my house Morty can move when he has high-energy like that. Also in the video, you can see how the XL pads fit onto the regular size holder, and the extra overage it provides - should you have a dog like Morty who needs a little extra overhang because of his aiming woes. I've also included photos of my pup, Morty. He'd climbed up on the chair for no reason really, but it's another example of his high-energy :)
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Reviewed in the United States on July 22, 2017
E
Verified Purchase
Emily
Lake Worth, US
★★★★★ 5
Does what it says
Color: Dark Gray, Size: 22" x 22"
I was using just a puppy pee pad on the floor, but when my puppy started to become rambunctious....she'd quickly grab it and play with it...shred it and try to eat it. I also noticed that she tended to only want to use the edges of the pee pad majority of the time....so I typically ended up with it on the pee pad and then a puddle next to it. I had to do something. On Amazon I go like always and I found this. Didn't even know this existed. Works beautifully. I've had this for around 2 months now. Fits standard pee pads perfectly. It cleans easily. It doesn't hold in any odor. This does not completely keep my puppy from peeing on the floor. This is not the products fault, she aims towards the edges for whatever reason. If anything, it's helped keep more of it in. The raised edges do seem to encourage her to stay inside of it. We rarely have "accidents" now and no more shredding pee pads. See below. *On another note- she has scratched at the pee pads, like she's digging in the dirt for gold as well as chewed on the plastic a fews times. I was worried I'd have to find another solution. She gets redirected with her chew toys and gets a treat every time she uses it correctly (no chewing or digging). At this time it doesn't seem like it will be an issue that I need to address. She hasn't done it since. So if your dog is determined this will NOT stop them. This product is not indestructible, please know this! It can be chewed on and if determined they can still get to the pee pad. I don't understand why some people rate it poorly when the product is doing what it's "intended" to do. You just have to know your situation and find the best solution you can live with. A dog is going to be a dog. Please address why they are doing what they're doing to begin with. I realized that my pup (*puppies will chew) wasn't getting enough mental stimulation, she's an Aussie. She had physical but not enough mental stimulation. Combine that with making sure we only encourage the wanted behavior and simply dismiss the unwanted behavior. I'm not saying I'm a pro, far from it... nor is everyone's situation the same....I'm just saying don't expect a product to do your job, expect what it says it's intended use is for. :)
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Reviewed in the United States on August 27, 2024
A
Verified Purchase
A. Iacono
New York, US
★★★★★ 1
NO GO!
Color: Dark Gray, Size: 22" x 22"
I was really hoping this would work, but it did not. The minute I put the tray down with puppy pad secured, my puppy managed to chew and dig at the edges ripping the pad away from the side of the tray and making a huge mess! I am not returning it bc this company makes you take it to UPS which is not convenient for me, so maybe I will donate it. If your puppy is massive chewer this may not be the thing for you.
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Reviewed in the United States on May 2, 2026
T
Verified Purchase
T.H
Lowell, US
★★★★★ 3
Great idea.
Color: Dark Gray, Size: 22" x 22"
Great concept! Unfortunately, the plastic area underneath the pad area isn’t very thick and flexes. When my dog used it the first time the plastic flexing up and down under her feet frightened her a little bit. I placed a rubber mat between the pee pad and the flimsy plastic and that stopped the plastic from flexing but since it scared my dog from the first use she won’t go back on it.
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Reviewed in the United States on March 17, 2026
K
Verified Purchase
Kimberly B.
Carnegie, US
★★★★★ 5
PERFECT PEE PAD HOLDER: AFFORDABLE, EASY TO CLEAN & CHANGE THE PEE PADS, HOLDS PADS IN PLACE
Color: Navy, Size: 22" x 22"
I was THRILLED when we finally received it! I had been everywhere on Amazon & some other sites. I almost bought one that had a small pole since my newly adopted Chihuahua actually lifts his leg, unlike my previous male Chihuahua. But I kept running into a lot of holders that had a plastic "grill" to pee through the pad underneath. It didn't seem like it would be easy to clean. Plus, they were VERY expensive. However, I somehow came across this one. Once I saw the picture, it caught my attention. I watched the video & read more about. The only problem I remember is the video showed one that's foldable & easy to take anywhere with you. But that wasn't the case when we received it. However, I was still very happy with it. The only thing I wasn't crazy about was having to change pee pads because of the size. I changed to Earth Rated because that's what was recommended for this holder. My Chihuahua is around 5 years old & was "housebroken" before I adopted him from a shelter early last year. We live in an apartment on the first floor. But can't always run out the door when he has to go potty. He can wait, but I simply can't drop everything I'm doing to take him outside & I don't want to keep him waiting. He wouldn't really use it at first. But he finally got the hang of it. It's very convenient for him. I bought it primarily because I can't always go outside. Yet, it's perfect when it's raining & neither of you can't go outside, it's great to have when it's not safe to go outside in this area. I bought this around Black Friday week & got it for half its regular price! I'm thinking of getting another one to give him more space (sometimes he misses & accidentally sims for the floor). I've been cleaning it every time the pad needs to be changed. I use Biokleen Bac-Out for Pet Stains & Odors - Lavender Lime scent, which works great, but it's too expensive on Amazon. Also Earth Rated pads don't seem to work well with minimizing odors. I also find it a bit difficult to see if my dog peed because the bottom color is green. But they fit well & have adhesive corners. My dog never chews on the pads. The only problems he has is that he likes to push & pull the pad like dogs do to the grass outside when they finish peeing or pooping. Also, I don't know if the holder we have has non-slip small parts on the corners underneath. So since the floor is laminate & maybe has gotten more slippery from cleaning with the Enzymatic spray cleaner I use, the holder has been slippery lately. In the meantime, I'll try out the 100 pee pad pack sold by Iris, the maker of the holder. The previous pads don't have pads in the right size. I'm referring to Hartz 24 Hour Miracle Pee Pad in Lavender. They're white, but very absorbent & the best part: they help neutralize the odors. I absolutely recommend this pee pad holder! We got the Navy, 22" x 22", which was on a HUGE sale for HALF ITS PRICE! It's too bad I didn't buy two! It's easy to take apart (the top from bottom) to clean. The handles that latch down & the design do a good job of keeping the pads in place. If only I can find pads like Hartz, I wouldn't have to change the pads so much lately. Although I LOVE the Enzymatic cleaner Biokleen Bac - Out for Pet Stain & Odors in Lavender Lime, I'm getting tired from cleaning. But hopefully when it gets warmer here in Florida, it'll get easier again. My dog is really wonderful! I bought this NOT to be lazy, but to give him a happier, more comfortable life. He seems to be happy to have the convenience of the pee pads & enjoys watching me clean!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 18, 2026

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