1991 Lexus LS400 Base 8 Cyl 4.0L
How to splice a REPT960910 o2 sensor to my old wiring harness.
REPT960910 o2 sensor wires are gray and black, old harness wires are blue and white.
Contact the manufacturer of the sensor or go to their website and ask them for a color code for the application that you are working on. In the last 20 years I can count the number of times on one hand that I have used a universal O2 sensor. It is NOT worth the trouble and risk. The splice connections that you have to make are way more at risk of future failures at the splice. Next time buy a direct fit sensor for the add'l money.