Just Lambda, the one stop shop for Lambda Sensors and Oxygen Sensors. Fast and efficient postal service. All our prices include post and packing and VAT. Just Lambda, the one stop shop for Lambda Sensors and Oxygen Sensors. Fast and efficient postal service. All our prices include post and packing and VAT.

Common Wire Colour Variations.

Zirconia Sensors Fitted to 85% of vehicles on the UK roads fitted with a catalytic convertor




One Wire Zirconia Sensor
Output 0.1 to 0.9 Volt

Colour Connection
Black - Signal



Two Wire Zirconia Sensor
Output 0.1 to 0.9 Volt

Colour Connection
Black - Signal
White - Earth



Colour Connection [Alternative]
Black - Signal
Grey - Earth



Three Wire Zirconia Sensor
Output 0.1 to 0.9 Volt

Colour Connection
Black - Signal
White - Heater
White - Heater



Colour Connection [Alternative]
Blue - Signal
Black - Heater
Black - Heater



Four Wire Zirconia Sensor
Output 0.1 to 0.9 Volt

Colour Connection
Black - Signal
Grey - Earth
White - Heater
White - Heater



Colour Connection [Alternative]
Blue - Signal
White - Earth
Black - Heater
Black - Heater
Click here for other Zirconia Wire Colours


Titania Sensors Fitted to 10% of vehicles on the UK roads fitted with a catalytic convertor




Three Wire

Colour Connection
Black Ref. (out)
Red Ref. (in) and Heater (+)
White Heater (-)
250-23880

Universal Titania Sensor
Output 0 to 1 Volt*
*(See below)



Three Wire

Colour Connection
Black Ref. (out)
Red Ref. (in) and Heater (+)
White Heater (-)
250-23881

Universal Titania Sensor
Output 0 to 1 Volt*
*(See below)



Four Wire

Colour Connection
Black Ref. (out)
Yellow Ref. (in)
Red Heater (+)
White Heater (-)
250-24883

Universal Titania Sensor
Output 0 to 5 Volt



Four Wire

Colour Connection
Black Ref. (out)
Yellow Ref. (in)
Red Heater (+)
White Heater (-)
250-24882

Universal Titania Sensor
Output 0 to 5 Volt

Quick Check List

1. Count the number of wires on the original sensor.
2. Check the colour of the wires
   a. If the sensor has black, grey, purple or white wires, it will be a Zirconia sensor.
   b. If the sensor has one red wire (and or yellow) with the possible exception of some
       Japanese vehicles, it will be a Titania sensor.
3. If it is a Titania sensor then check the original thread size of the sensor.
4. If you have ant doubt or query, please contact us.

* In some applications fitted with three wire Titania oxygen sensors, the output is 0 to 5 volts.

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