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AEM

AEM 30-0300 X-Series Wideband UEGO AFR Sensor Controller Gauge

  • Based on 2,049 reviews
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Features

  • The X-Series wideband UEGO AFR sensor controller gauge (PN 30-0300) features a modern, visually striking faceplate and new seven-segment, center display that is 87% larger than the 30-4110 AEM
  • 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
  • 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
  • Faster response time improves wideband feedback control, and can provide a safer, more powerful and accurate tune
  • When tuning an engine using wideband AFR feedback control on an inertia dyno, dead time affects the data you are looking at because it is reported in a different operating location than when it actually occurred

Description

AEM's X-Series wideband UEGO Air/Fuel ratio sensor controller gauges are built upon unique, patent-pending X-Digital technology that makes them the fastest responding wideband air/fuel ratio controllers in independent testing against 17 other wideband UEGO air/fuel controllers.

Specs & Other Info

SpecificationDetails
BrandAEM
Construction MaterialDurable Plastic
Weight of Item1.43 pounds (0.65 Kilograms)
DesignContemporary
Accuracy of MeasurementSuperior
Installation MethodFlange Mount
Primary UseTimekeeping
ManufacturerAEM
Product Model30-0300
Origin of ManufactureChina
Product ExteriorFinely Machined
Manufacturer & OEM Part Number30-0300
Release DateNovember 18, 2015
Current StatusNot Discontinued

Frequently asked questions

The AEM X-Series UEGO Gauge is a tool used to monitor and display the air/fuel ratio (AFR) of your vehicle. This is essential for tuning and optimizing your engine performance. It ensures that your engine runs at the best efficiency, resulting in better fuel consumption, more power, and less potential for damage.

The AEM 30-0300 X-Series Wideband UEGO AFR Sensor Controller Gauge is versatile and can be used with most vehicles that have an On-board Diagnostics (OBDII) port. However, before purchasing, it's always recommended to check if your specific vehicle model is compatible with this device.

The AEM 30-0300 X-Series Wideband UEGO AFR Sensor Controller Gauge is known for its excellent accuracy. It uses Bosch 4.9 LSU wideband UEGO sensor and the fastest controller technology in a 52mm gauge providing real-time AFR values with less than 100 millisecond response time.

The AEM X-Series UEGO Controller Gauge is generally easy to install with appropriate mechanical experience. The package includes a complete installation manual with step-by-step instructions. However, if unsure, it's recommended to have it installed by a professional to avoid any potential damage.

Top Amazon Reviews

🚀 Abunda's Overview

This is our summary and key points to consider based on customer reviews.


These reviews suggest that the product is exceptional for fine tuning engines, enhancing power, and improving overall vehicular performance. It seems convenient to install, works great after initial adjustments and provides good value for the price. Note that some users have reported issues with the bezel and recommend testing the product immediately following purchase.

Pros

  • 🔥 Considerably enhances engine performance.
  • 🔧 User-friendly installation process.
  • 💰 Provides good value for money.
  • 💡 Allows for precise tuning.

Cons

  • 😕 Some users found the bezel thick, causing aesthetic concerns.
  • ☝️ Needs immediate testing after purchase to ensure perfect functionality.
  • 🎨 Matte finish of the bezel didn't match with most interiors which may require additional modification (like painting).

Should I Buy It?

Based on the high ratings, user satisfaction, and multi-functional use, it is recommendable to purchase the product assuming the minor concerns raised aren't significant hindrances. It appears to deliver excellent results in terms of tuning and boosting performance, thereby making it a valuable addition to your automotive toolbox.


  • It’s the real deal 👍🏼 It’s the real deal 👍🏼
I’m writing this for people on the fence about whether it is the real AEM gauge/sensor or not. It is, I went to AEM’s website and compared the part numbers and pics and it is exactly the same. I installed it per instructions and warnings and it is working perfectly. It’s a good deal and a great product. ... show more
Reviewed in the United States on November 6, 2025 Reviewed in the United States on November 6, 2025 by William B.

  • Good guage
Easy installation and a great tool getting my motor tuned
Reviewed in the United States on November 2, 2025 by aaron

  • Great product
Works exactly as it should.
Reviewed in the United States on December 15, 2025 by jason morgan

  • Do not buy a glow shift gauge
Buy this over the glow shift. Glow shift, wine, bands, and all sensors read inaccurately. Yes they are cheap but this AFR gauge is one of the best you can get. It’s either this one or an innovate gauge just please don’t buy a cheap eBay one.
Reviewed in the United States on March 20, 2026 by Jonah Pritchett

  • Excellent gauges
Easy install. functionality's is excellent great readings. very durable. great value for the money excellent display. Easy adjustment for different readings.
Reviewed in the United States on March 14, 2026 by Blia Vang

  • Easy install Easy install
Easy to wire up and works great.
Reviewed in the United States on September 27, 2025 Reviewed in the United States on September 27, 2025 by Yosuan Noriega

  • Works but 02 doesnt last
Gauge works great but 02 sensor went bad after 2 uses and isnt covered under warrant recommend gettin the actal bosch o2 sensor
Reviewed in the United States on March 26, 2026 by Nathan Morrisett

  • Genuine AEM product Genuine AEM product
Authentic sensor and security sealed from AEM. Comes with authentic FAE sensor & paper warranty information.
Reviewed in the United States on December 29, 2025 Reviewed in the United States on December 29, 2025 by Goat_Cheeze

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