---
product_id: 50068512
title: "30-0300 X-Series Wideband UEGO AFR Sensor Controller Gauge"
brand: "aem"
price: "₩753891"
currency: KRW
in_stock: true
reviews_count: 7
category: "Aem"
url: https://www.desertcart.kr/products/50068512-30-0300-x-series-wideband-uego-afr-sensor-controller-gauge
store_origin: KR
region: South Korea
---

# fastest wideband response 87% larger display multi-output data logging 30-0300 X-Series Wideband UEGO AFR Sensor Controller Gauge

**Brand:** aem
**Price:** ₩753891
**Availability:** ✅ In Stock

## Summary

> ⚙️ Tune like a pro, see like a boss — never miss a beat with AEM X-Series!

## Quick Answers

- **What is this?** 30-0300 X-Series Wideband UEGO AFR Sensor Controller Gauge by aem
- **How much does it cost?** ₩753891 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/50068512-30-0300-x-series-wideband-uego-afr-sensor-controller-gauge)

## Best For

- aem enthusiasts

## Why This Product

- Trusted aem brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Slim & Stylish Design:** Ultra-thin profile fits virtually anywhere, with customizable faceplates to match your cockpit vibe.
- • **Massive 87% Larger Display:** See your AFR data with unmatched clarity on a sleek 52mm gauge face.
- • **Lightning-Fast X-Digital Tech:** Experience the quickest wideband response for precision tuning and safer performance.
- • **Pro-Level Calibration & Control:** User-configurable AFR modes, auto-dimming, and locking connectors ensure race-ready reliability.
- • **Versatile Multi-Output Connectivity:** 0-5V, RS232, and CANbus outputs for seamless integration and real-time data logging.

## Overview

The AEM 30-0300 X-Series Wideband UEGO AFR Sensor Controller Gauge is a race-only, precision air/fuel ratio monitor featuring an 87% larger seven-segment display, ultra-fast X-Digital sensor technology, and multiple output options (0-5V, RS232, CANbus) for advanced data logging and tuning. Its slim 52mm design with customizable faceplates and auto-dimming makes it a versatile, professional-grade tool for serious performance enthusiasts.

## Description

Product 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. 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 allow 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. Legal Disclaimer WARNING: Cancer and reproductive Harm www.P65Warnings.ca.gov

Review: Seller didn't advertise this item properly - Some of the digits were not working properly.
Review: Beware - Fake item - The gauge came in a rather scruffy but genuine looking AEM box. However the gauge and sensor included were not genuine - The gauge was not even marked as AEM, and the sensor was not a Bosch unit. Have requested refund.

## Features

- This is a "race use only" product. No warranty for the Lambda Sensor. Return of the sensor is not accepted
- 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. Display Gasoline values from 8.0:1 to 20.0:1 AFR
- Faster response time improves wideband feedback control, and can provide a safer, more powerful and accurate tune

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0184TSI84 |
| Best Sellers Rank | 175,377 in Automotive ( See Top 100 in Automotive ) 11 in Car Electrical Air & Fuel Ratio |
| Brand | AEM |
| Customer Reviews | 4.6 4.6 out of 5 stars (2,041) |
| Date First Available | 4 Dec. 2015 |
| Exterior | Painted |
| Item Weight | 0.28 g |
| Item model number | 30-0300 |
| Manufacturer | Advanced Engine Management |
| Manufacturer part number | 30-0300 |
| Model | 30-0300 |
| OEM Part Number | 30-0300 |

## Product Details

- **Brand:** AEM
- **Global Trade Identification Number:** 00840879024437
- **Item weight:** 0.01 Ounces
- **Material:** Plastic
- **UPC:** 840879024437

## Images

![30-0300 X-Series Wideband UEGO AFR Sensor Controller Gauge - Image 1](https://m.media-amazon.com/images/I/61NZ-5-mnOL.jpg)

## Questions & Answers

**Q: Dose this item come with the collar to weld to the exhaust?**
A: Yes, this comes with the weld on boss

**Q: Is the weld-on boss mild or stainless steel?**
A: It is mild steel. You can find stainless steel bung if you want on our store. It is sold separately.

**Q: I want this just to raad my a/f just when i am using nitrous. will this work for that so as i spray nitrous & fuel if to leen or rich on the hit i can**
A: Yes, it will do what you need.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Seller didn't advertise this item properly
*by R***U on 9 October 2025*

Some of the digits were not working properly.

### ⭐ Beware - Fake item
*by C***R on 29 April 2023*

The gauge came in a rather scruffy but genuine looking AEM box. However the gauge and sensor included were not genuine - The gauge was not even marked as AEM, and the sensor was not a Bosch unit. Have requested refund.

### ⭐⭐⭐⭐⭐ Review
*by S***A on 22 August 2024*

Tengo 2 meses de uso y está funcionando perfectamente

## Frequently Bought Together

- AEM 30-0300 X-Series Wideband UEGO AFR Sensor Controller Gauge
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**Shop now:** [https://www.desertcart.kr/products/50068512-30-0300-x-series-wideband-uego-afr-sensor-controller-gauge](https://www.desertcart.kr/products/50068512-30-0300-x-series-wideband-uego-afr-sensor-controller-gauge)

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-02-14*