I recently looked this up for somebody else. I think the "L" might stand for blue.
I looked it up in my CD Service Manual. I don't understand the abreviations, but maybe this will help.
For the "Heated Oxygen Sensor", Bank 1 Sensor 2:
pin 1 color B? HT
pin 2 color L-W? +B
pin 3 color W? OX
pin 4 color BR? E1
Air Fuel Ratio Sensor, Bank 1 sensor 1
pin 1 HAFR (right), color L?
pin 2 color B-R?
pin 3 AFR+ (right), color R?
pin 4 AFR-, color G?
Air Fuel Ratio Sensor, Bank 2 Sensor 1
pin 1 HAFL (left), color G?
pin 2 color B-R?
pin 3 AFL+, color L?
pin 4 AFL-, color B-W?