SKU: 12804085197

AEM X-Series OBD-II Wideband AFR Controller Gauge

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Description

AEM X-Series OBD-II Wideband AFR Controller GaugeOverview AEM's X Series OBDII Wideband UEGO AFR Sensor Controller Gauge (PN 30 0334) provides tuners who are using piggyback tuning modules or open source software with the ability to view AFR through the factory CAN bus stream that is output by the factory ECU, and deliver the most accurate, safe and powerful tune. The 30 0334 X Series OBDII Wideband Gauge is validated to work with EFILive, HPTuners and DashDaq software. The X Series Wideband AFR

Overview

AEM's X-Series OBDII Wideband UEGO AFR Sensor Controller Gauge (PN 30-0334) provides tuners who are using piggyback tuning modules or open source software with the ability to view AFR through the factory CAN-bus stream that is output by the factory ECU, and deliver the most accurate, safe and powerful tune. The 30-0334 X-Series OBDII Wideband Gauge is validated to work with EFILive, HPTuners and DashDaq software.

The X-Series Wideband AFR OBDII Gauge includes an OBDII pass-through connector and Bosch 4.9LSU sensor that can be free-air calibrated or used with the factory resistor calibration. Additional wiring for a 0-5v or RS232 Serial output can be added by the user for outputting to a data logger. This OBDII pass-through capability replaces the traditional AEMnet stream available in the 30-0300 X-Series Wideband AFR Gauge Controller.

OBDII CAN-bus OUTPUT
The OBDII output simulates an auxiliary ECU signal when plugged into a vehicle’s OBD port, which requires a unique address from the other ECUs already on a vehicle’s network. AEM’s default OBDII CAN address will work with most popular vehicles and adjustments should not be necessary. However, AEM has provided OBDII address programmability through the buttons on the gauge face if a different address other than the default address is required, allowing users to program ECU #, Parameter Identification (PID), Message Identifier, and Bit Rate.

PATENTED X-DIGITAL TECHNOLOGY – It’s The Fastest
X-Series Widebands are the fastest responding wideband air/fuel ratio controllers in independent testing against 17 other wideband UEGO air/fuel controllers.* The controller’s high speed, patented, X-Digital technology (Patent 9,575,030) 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 reduce deadtime and can improve the performance of your vehicle through more accurate AFR tuning.

FACTORY CALIBRATION RESISTOR OR FREE-AIR CAL, IT’S YOUR CHOICE!
X-Series Wideband Gauges and the 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. 

X-SERIES WIDEBAND UEGO CONTROLLER FEATURES:

  • Patented X-Digital Technology makes it the Fastest Responding Wideband AFR Controller (Patent # 9,575,030)
  • OBDII pass-through provides AFR readings through the factory ECU CAN-bus – Ideal for users with piggyback programmers or open source tuning software
  • Includes Bosch 4.9LSU wideband UEGO sensor and OBDII pass-through connector
  • Use the factory 02 calibration or free-air calibrate using buttons on faceplate
  • Compatible with vehicle/system voltages up to 16V
  • Optional outputs for 0-5V & RS232 for data logging and feedback control (requires wiring)
  • 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%, 3- or 4-digit display and OBDII output settings (if necessary)
  • Black bezel and black dual faced faceplate included (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
  • OBDII Output Gasoline values from 8.0:1 to 20.0:1 AFR
  • OBDII Output Lambda values from .55 to 2.00
  • 0-5V Output Gasoline values from 8.5:1 to 18.0:1 AFR (Requires Wiring)
  • 0-5V Output Lambda values from .58 to 1.23 (Requires Wiring)
  • 0-5V Output E85 values from 5.7:1 to 12.0:1 AFR (Requires Wiring)
  • 0-5V Output Ethanol values from 5.2:1 to 11.0:1 AFR (Requires Wiring)
  • 0-5V Output Methanol values from 3.75:1 to 8.0:1 AFR (Requires Wiring)
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 12804085197

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4.6 ★★★★★
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Pratik @ Toronto, CA
Waukegan, US
★★★★★ 5
Excellent Product - USB C - power and data transfer!
Color: Black
It works great. I used this to connect two USB-C devices: one from the POS printer and another for charging, both connected to my tablet into one USB-C. It solved the biggest issue that I was facing.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 21, 2026
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John3.16
Lexington, US
★★★★★ 5
Great choicd
Color: Black
Work great, size is compact and out of the way.
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Reviewed in the United States on June 11, 2026
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Verified Purchase
Aaron
Lowell, US
★★★★★ 5
Great 10gbps USB-C Hub, worked with Anker support through compat issues with PD4 iteration 1
Original Review (updates below): ----- The moment I noticed this thing on Amazon, I bought it and it literally just arrived. Finally, 4K60 over just USB-C with other ports (including making up to 10Gbps available to them) for a reasonable price. Unfortunately, the first two things I've done with it were both disappointing. I'll cut to the chase, the power delivery pass through isn't working with one of their own chargers. The first device I tried connecting this with is my Anker PD4 with one USB-C cable as the only thing plugged into it so I can test the truly up to 100W (-15 for its own power) claims. I've tried connecting it with Apple's 2m USB-C charge cable (100w capable) and an equivalent CableMatters cable that also supports 100W. When plugged directly into my laptop, both of these cables immediately start charging it and show up as 100W power sources. When this Anker hub is plugged in and either of them is connected to the power delivery port on the side of it, the laptop does not charge (laptop is a 16" Macbook Pro, I've tried multiple ports just for the heck of it). My second complaint is that when absolutely nothing is plugged into it, it becomes fairly warm to the touch. Why, when it's doing nothing, is it hot? I'm clearly not running data or even power through it so I have low hopes for it under load. The fact that it doesn't work in exactly the scenario they want it to most (a MacBook Pro with one of their own chargers) seems like a pretty big fail. I've got lots of USB-C things though so I thought I'd grab a couple and try those. Using an Apple 96W USB-C charger, the device does pass through power delivery properly. It shows up as providing 79W to the laptop (siphoning off 17W in this instance). I also have a 56W Aukey charger that splits power between a USB-A port and a USB-C port that can provide 45W of power delivery. When plugged into that charger it does appear to work as well and appears in macOS as a 30W power source. Maybe the problem is the Anker PD4? But it works fine providing power to the laptop directly. Would love to hear from Anker about these two products working together and what I should actually expect. Having it be unreliable for power delivery isn't great, but power and heat aside (it is getting a little bit warmer now that it's providing power from the Apple power adapter, but still definitely holdable), the hardware looks and feels good and the cable feels durable. Worth also noting that there's a white LED ring on the side of it that appears to be always on when it's plugged in. Don't know why it needs an LED. ----- Update, June 22, 2020: I've done some more testing and Anker has reached out to me to investigate what might be the issue. I can say that the hub works as I would expect from a quick test with my iPad Pro 11" with the above functioning chargers. It was able to pass through power with the 96W Apple Charger on the other end to both the iPad port as well as a Magic Keyboard port. The ethernet adapter showed up in iOS settings and an external drive was functional. When connected via the Magic Keyboard, which is a power only connection, as expected it provided only power. Still no power passthrough of any kind when connected to the PD4. ----- Update July 1, 2020: I've written back and forth with Anker and they've sent me a replacement hub. It also doesn't work with the PD4. I've tried multiple USB-C cables but they have also shipped a cable to test with it. For now I'm increasing the review from 2 to 3 stars because I am more and more suspicious about the PD4 and less about this hub. They claim that they have tested the setup I have separately without issue, and I've sent video showing the problems I've encountered, so the troubleshooting is ongoing. Have had a chance to use Ethernet on it without issue. Still need to try to test out its throughput when trying to use a 10Gbps USB-C enclosure and a 4K60 monitor at the same time (+ ethernet). More updates to come. ----- Update July 10, 2020: I've continued to talk with Anker support and they shipped me a replacement PD4. The one I had was labeled as "Iteration 1" on its barcode, the one I got back was labeled "Iteration 2". I tested it out and it works perfectly with this hub, passing through the correct amount of power to multiple Macbook Pros and fast charging an iPad Pro. Clearly the fault doesn't lie with this hub and is instead an issue with the first iteration PD4, so I'm updating my review accordingly. Working with Anker support was great. I've also been able to test USB-C throughput (without driving a display as well so far) and it properly utilizes 10Gbps. I've attached some extra images showing various devices connected to it (keyboard dongle, SD card, USB-C 10Gbps external SSD enclosure, USB sound card, ethernet).
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Reviewed in the United States on June 19, 2020
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Verified Purchase
Juan Muratalla
Phoenix, US
★★★★★ 5
Excellent Quality and Reliable Performance from Anker’s 8-in-1 USB-C Hub
I’m really impressed with this Anker USB-C Hub with Ethernet (8-in-1). The build quality feels premium, setup was completely plug-and-play, and all ports work flawlessly with my laptop. The Ethernet connection is stable and fast, which has been perfect for work calls and large file transfers. I also love how compact and portable it is while still offering plenty of connectivity options. HDMI output looks great, USB ports transfer quickly, and the SD card reader is very convenient for photo and video work. Anker continues to deliver reliable products, and this hub is no exception. Highly recommended if you need a dependable all-in-one USB-C hub for productivity or travel.
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Reviewed in the United States on May 20, 2026
T
Verified Purchase
Tommy
Pawtucket, US
★★★★★ 5
Works great (quick test)
Just got this and tested and works great I attached to my MacBook with Ethernet and had a solid connection I tested my steam deck by plugging in Ethernet then adding HDMI then adding power and everything worked as it was plugged in I tested my Nintendo switch even though it clearly states it's not supported and it did not work at all. Even the power pass through did nothing. This is not even remotely a problem since it was advertised as such but I figured it was with a try and worth noting
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Reviewed in the United States on May 31, 2026

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