Wideband Oxygen Sensor Upgrade For Commander 950 w/ Bosch LSU4 sensor

Wideband Oxygen Sensor Upgrade For Commander 950 w/ Bosch LSU4 sensor

PART# 534-197

Not Available Online


The wide band oxygen sensor is the ultimate addition to any new or existing Commander 950 EFI system. It will plug directly into any Commander 950 harness and accurately measure any air/fuel ratio between 10:1 and 18:1. This allows the engine tuner to read the air/fuel ratio in real time for extremely accurate tuning. The 534-197 upgrade kit is intended for the cost conscious consumer who wants the tuneability of a wide band oxygen sensor but cannot afford the high prices generally associated with a wide band oxygen sensor. The 534-197 can also be upgraded later for use with a NTK sensor by simply reconnecting a jumper loop and purchasing the NTK sensor. This upgrade kit requires you to have the “PRO” C950 software and firmware. Commanders 950 ECU’s manufactured in 2004 and later already have “Pro firmware installed. So your ECU is older than 2003? No need to worry the kit also includes a certificate that allows the ECU to be returned to Holley for a free “PRO” firmware upgrade. Also, the “PRO” software and manual are available for downloading at


  • Small weather-sealed unit for convenient mounting
  • Easy Installation
  • Accurately measures A/F ratio between 10:1 and 18:1
  • Upgrade an older C950 ECU to “PRO” software compatibility with included certificate
  • Low cost


Product TypeEFI Part
WarningCalifornia Proposition 65

Tech Resources

WARNING FOR 534-197: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
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