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#1
10-12-2007, 05:07 PM
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O2 sensor electronics testing
Hi guys,
I have 1992 500sel.m119 I understand that oxygen sensors put out 0.1 to 1 volt of DC depending on the exhaust fumes. Now if I disconnect O2 sensor and connect 1volt battery to terminals that go to computer will you notice the difference in engine sound? I suspect my computer to not working properly as I connect the 1volt battery to O2 terminals I hear no difference in engine sound, it would run the same as O2 sensor connected or not or 1 volt battery connected or not. Does that make you think that computer went south? Mechanic pulled codes. Idle switch on gas pedal and starter lock out/back up switch on the transmission came up. I have both checked with ohmmeter and they both work fine. Any ideas what is happening with my car? Thanks
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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 BlackChime 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 
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