NARROW BAND 02 SENSOR USED ON CHEVROLET AND FORD ENGINES USED POST CAT IN FORD APPLICATION (4 WIRE) Indmar Marine O2 Sensor – Narrow Band Sealed | Part #596100 Restore accurate fuel mixture control with this genuine Indmar narrow band oxygen sensor, sealed configuration. The O2 sensor is a critical feedback component in your Indmar fuel injection system — continuously monitoring exhaust oxygen levels and sending real time data to the ECU to maintain the correct air/fuel ratio for performance, economy, and emissions compliance. Compatible with: Indmar marine engines with narrow band O2 sensor applications fitted to Malibu, Moomba, Supra, and Tige boats. Contact us