Bosch LSU 4.9 Wideband Wideband O2 Sensor.
Compatible with Spartan Lambda Controller 2, SLC PP 2.1, iDash (pruchased after Jan 1 2015), and SLC Free A/B
Not compatible with Spartan Lambda Controller 1, SLC DIY2, SLC PP2, SLC Gauge, SLC OEM, iDash (purchased before Jan 1 2015), and SLC Free C.
The LSU 4.9 is a cost effective Wideband O2 sensor providing 0.01 Lambda accuracy, fast response, and rated life of 100,000 km.
Only $50 with any Wideband O2 Controller Purchase; Limit 1 sensor per controller purchase, $75 without.