AEM X-Series OBDII Wideband UEGO AFR Gauge – 52mm (30-0334)

Accurate air/fuel ratio monitoring is one of the most important aspects of tuning and protecting a high-performance engine. The AEM X-Series OBDII Wideband UEGO AFR Gauge is engineered to provide exceptionally fast and precise AFR monitoring while integrating directly with a vehicle's factory OBDII CAN-Bus network.

Designed for tuners using factory ECUs, piggyback systems, or open-source tuning platforms, the X-Series OBDII Wideband Gauge allows AFR data to be transmitted directly through the vehicle's OBDII communication stream. This enables seamless integration with popular tuning software such as EFILive, HP Tuners, and DashDaq, providing accurate AFR data for safer and more effective tuning.

At the heart of the system is AEM's patented X-Digital Wideband Technology, which has been independently proven to be one of the fastest responding wideband controllers available. Its rapid response time allows the system to detect even the smallest AFR fluctuations, helping tuners optimize engine performance while maintaining safe operating conditions.

The included Bosch LSU 4.9 wideband sensor provides highly accurate AFR measurement, while support for both factory resistor calibration and free-air calibration ensures long-term accuracy and flexibility.

Trusted by professional tuners and motorsport teams worldwide, AEM wideband systems deliver the precision and reliability required to maximize engine performance and protection.

Carefully selected for builders who demand proven performance without compromise.

Why Monitor Air/Fuel Ratio?

Accurate AFR data is critical when tuning an engine.

✔ Running excessively rich can reduce power and efficiency
✔ Running too lean can cause severe engine damage
✔ AFR monitoring allows precise fuel tuning for maximum performance
✔ Essential for turbocharged, supercharged, and modified engines
✔ Provides valuable real-time engine safety information

Key Features

✔ Genuine AEM X-Series OBDII Wideband UEGO AFR Gauge
✔ Direct OBDII CAN-Bus integration
✔ Patented X-Digital Wideband Technology
✔ Bosch LSU 4.9 Wideband Oxygen Sensor Included
✔ Supports factory resistor calibration and free-air calibration
✔ Compatible with popular tuning software platforms
✔ User-programmable OBDII communication settings
✔ Optional analog and serial output capability
✔ High-speed AFR response and data transmission
✔ Large high-visibility digital display

Technical Specifications

✔ Brand: AEM Electronics
✔ Part Number: 30-0334
✔ Product Type: Wideband AFR Gauge & Controller
✔ Gauge Diameter: 52 mm (2-1/16")
✔ Sensor Type: Bosch LSU 4.9 Wideband Oxygen Sensor
✔ Display Type: Digital LED
✔ Communication: OBDII CAN-Bus
✔ Additional Outputs: Optional 0–5V Analog and RS232 Serial Outputs
✔ Calibration Methods:

• Factory Calibration Resistor
• Free-Air Calibration

OBDII CAN-Bus Features

✔ Direct OBDII Pass-Through Connection
✔ Simulates Auxiliary ECU Data Stream
✔ User Programmable CAN Addressing
✔ Adjustable ECU Address Settings
✔ Adjustable Parameter Identification (PID)
✔ Adjustable Message Identifier
✔ Adjustable CAN Bit Rate

Compatible Tuning Software

✔ EFILive
✔ HP Tuners
✔ DashDaq

X-Digital Wideband Technology

Benefits

✔ Extremely fast AFR response time
✔ Superior transient response accuracy
✔ Minimal signal delay
✔ Improved tuning precision
✔ More accurate closed-loop fuel control

Why Response Time Matters

Faster AFR feedback allows:

✔ More accurate fuel adjustments
✔ Improved tuning consistency
✔ Better engine protection
✔ Safer operation under boost
✔ Maximum performance optimization

Calibration Flexibility

The X-Series supports two calibration methods:

Factory Calibration Resistor

✔ Maximum accuracy when sensor is new
✔ Uses Bosch factory calibration values

Free-Air Calibration

✔ Allows recalibration as sensor ages
✔ Helps maintain long-term accuracy

Package Contents

✔ AEM X-Series OBDII Wideband Gauge Controller
✔ Bosch LSU 4.9 Wideband Oxygen Sensor
✔ OBDII Pass-Through Connector
✔ Installation Hardware

Compatible Applications

✔ Factory ECU Tuning
✔ Piggyback ECU Systems
✔ Standalone ECU Applications
✔ Turbocharged Vehicles
✔ Supercharged Vehicles
✔ Motorsport Vehicles
✔ Street Performance Builds

Compatible Engines

✔ 1JZ-GE
✔ 1JZ-GTE
✔ 2JZ-GE
✔ 2JZ-GTE
✔ Toyota Performance Engines
✔ Lexus Performance Builds
✔ Universal Applications

Shipping

🇪🇺 EU Delivery: 5–10 Business Days
🌍 International Delivery: 7–21 Business Days