AEM X-Series Wideband UEGO AFR Gauge Only, No Sensor - 30-0300NS

The AEM 30-0300NS is the X-Series 52 mm digital gauge with a built-in wideband controller that measures air/fuel ratio (AFR), sold without an oxygen sensor.

Pick this one if you already own an AEM/FAE or Bosch LSU 4.9 wideband sensor. Factory narrowband O2 sensors and Bosch LSU 4.2 sensors will not work. Need the sensor too? Get the complete AEM X-Series wideband gauge kit.

Fitment and requirements

• Requires an AEM/FAE or Bosch LSU 4.9 wideband sensor (not included)
• A weld-in O2 bung about 18 inches downstream of the exhaust port or turbo, ahead of any catalytic converter
• Switched 12V power and ground

What it does

• Shows AFR, lambda or O2 percent
• Auto-detects an AEM/FAE or Bosch LSU 4.9 sensor
• Free-air or resistor-trim calibration modes
• 0-5V analog, RS232 and AEMnet CAN outputs
• 52 mm (2-1/16 inch) body, 0.825 inch deep

What is in the box

• X-Series AFR gauge
• Wideband sensor cable
• Power/IO cable
• Mounting bracket
• Sensor not included

Installation and limitations

Power the gauge from switched 12V so the sensor heater shuts off with the key. Full details: AEM X-Series wideband instructions (PDF).

Specifications

• Part number: 30-0300NS
• Brand: AEM
• Warranty: 1 year manufacturer warranty
• Country of origin: United States
• Packaged size: 5.45 x 5.35 x 5.35 in, 1.145 lb
• UPC: 840879024772

Frequently asked questions

Does the AEM 30-0300NS include an oxygen sensor?

No. The AEM 30-0300NS is the gauge only. Buy the Bosch LSU 4.9 replacement sensor 30-2004 or choose the AEM X-Series wideband gauge kit, which includes a sensor.

Will my existing O2 sensor work with the 30-0300NS?

Only if it is an AEM/FAE or Bosch LSU 4.9 wideband sensor. Factory narrowband sensors and LSU 4.2 sensors will not work.

Can I log the AEM 30-0300NS with an HP Tuners MPVI4?

Yes, with extra hardware. Wire the gauge 0-5V analog output into the PROLINK+ cable (sold separately), which brings external 0-5V signals into VCM Scanner, and enter AEM's AFR scaling from the instructions. See the HP Tuners MPVI4.