ps2cho:

I too have no voltage coming out O2 sensor. It acts funny, when the car at certain temperature O2 sensor reads. When at some point voltage drops to 0 volts. I will buy new sensor and report back. And in terms of 8% duty cycle, I borrowed my mechanic friends $600 multimeter and duty cycle reads around 45% and my multimeter hovers around 8%. Try to use another multimeter and read your duty cycle again.

Let me know if you change your O2 sensor and your readings.

Thanks and good luck

__________________
1999 ML430 Silver 135k ml
Smoked LED taillights, Alpine in-dash DVD player, 12" sub, Pioneer components, 2 amps, 4200k HIDs, ML55 headlights, 20" rims, mirror LED blinkers

SOLD. 1996 E320 145k ml. Burgundy

SOLD but miss it everyday 1992 500sel Black
Chime buzzer mod,Alpine CD/MP3 player with stock amp,Euro headlights,S600 grill,20" rims, BEST CAR EVER!

SOLD. 1990 300E White
187k ml,smoked tails,Euro headlights,17rims,Intake,12" sub in first aid kit,alarm/autostart,buzzer mod