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Hey I'm having a nightmare trying to find what lambda sensor to put in my car. Don't suppose you know which one I need do you? The one that is in it is 18mm with 3 wires one red one black and one white but the only one I can find with those colour wires and that size is a zirconia one but on I have seen on this forum it says do not put zirconia ones in my car and to only put titania ones in my car but they only do 12mm titania ones ?
 

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If I were you I would just take it down to your local auto parts shop and get a genuine replacement.

You could also just try googling the part number off the old one and seeing if you can find one on ebay or something.

Also, any 3 wire o2 sensor will work.
In the case of a sensor with 2 white wires and 1 black wire you would go

existing sensor - replacement sensor
RED - WHITE
BLACK - WHITE
WHITE - BLACK

on the existing sensor:
the red and black wires are for the heating coil and do not matter which way they are connected
the white wire is ecu signal

on the new sensor:
the white wires are for the heater coil and do not matter which way they are connected
the black wire is ecu signal
 
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