Generic LSU 4.9 Wideband O2 Oxygen Sensor 5-Wire for AEM 30-4110/30-0300 Fast Heated Response

This LSU 4.9 wideband O2 sensor (17025 0258017025) is a direct-fit, 5-wire lambda sensor engineered for inline air–fuel ratio monitoring with popular AEM UEGO and X-Series controllers. It provides fast response and stable output across a broad AFR range, making it suitable for tuning, diagnostics, and performance monitoring in gasoline and flex-fuel applications. The sensor uses a heated sensing element for quick startup and consistent temperature control, and the five-wire harness ensures accurate signal and heater control when paired with compatible controllers.

Will this sensor work with my AEM wideband controller?

Yes — this LSU 4.9 is built to be electrically and functionally compatible with common AEM UEGO and X-Series modules, including part numbers 30-4110, 30-0300, and 30-0310. It matches the LSU 4.9 protocol and the heater wiring conventions those controllers expect, allowing plug-and-play integration in most installations when the controller is configured for an LSU 4.9 sensor.

• Compatible with AEM 30-4110, 30-0300, 30-0310 and similar UEGO units
• Five-wire connector supports heater and signal referencing
• LSU 4.9 sensor protocol for direct O2-to-AFR translation
• Works with controllers that accept heated wideband sensors

How fast and accurate are the readings?

The sensor is designed for rapid response and consistent measurements throughout the stoichiometric and rich-lean ranges. With a heated element it reaches operating temperature quickly and maintains stability, which reduces warm-up drift and improves real-time tuning feedback. Accuracy depends on controller calibration and installation, but the LSU 4.9 platform is a widely used standard for reliable AFR monitoring.

• Heated element for fast warm-up and stable temperature
• Responsive output suits dynamic engine tuning and logging
• Consistent performance across typical AFR ranges
• Accuracy optimized when used with calibrated AEM controllers

What are the installation and wiring basics?

Install the sensor in the exhaust stream where representative exhaust gases flow (usually pre- or post-turbo depending on setup) and avoid locations prone to pooling condensation. The five wires typically include signal, reference, heater positive, heater negative, and ground — match each to your controller wiring diagram and verify controller settings for LSU 4.9 operation before powering up.

• Mount in a threaded bung with correct thread size and torque
• Route wiring away from high heat and moving parts
• Confirm pinout with your AEM controller manual before connecting
• Allow sensor warm-up time for stable AFR readings

How long will the sensor last and how do I maintain it?

Service life varies with operating conditions, fuel quality, and exposure to contaminants. Proper installation, avoiding oil or silicon contamination, and not using the sensor where it’s exposed to continuous raw fuel or coolant will extend life. Replace the sensor when response slows, readings drift, or the controller reports sensor faults.

• Expected life depends on driving conditions and contamination exposure
• Avoid contact with oil, silicone, leaded fuel, and certain sealants
• Periodic checks of wiring and mounting improve longevity
• Replace when slow response or unstable AFRs appear

This LSU 4.9 5-wire wideband O2 sensor is for tuners, racers, and technicians who need dependable AFR data for engine mapping, diagnostics, and performance monitoring. If you run AEM UEGO/X-Series hardware and want a heated, OEM-style LSU 4.9 sensor with five-wire connectivity for precise control and fast response, this unit is a practical choice. It’s not a standalone meter — it requires a compatible wideband controller and proper installation to provide accurate air–fuel ratio information.