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  #1  
Old 01-14-2007, 01:31 AM
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Should the "o2" warning lamp illuminate when ignition turned on?

It may be in the owners manual, but I thought I would ask here first so I would not have to search, but does anyone know if the "o2" warning lamp is supposed to illuminate when the ignition is turned on?

I am wondering, because I have never seen mine illuminate, but ALL other lights work perfectly. I know that on most cars, that most lights will have a "check" moment, where warning lights illuminate, but I know there are some that do not. Oh, BTW - its a 85' W126 380SE.

Thanks!

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  #2  
Old 01-14-2007, 03:09 PM
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I don't believe mine comes on either but I will check it next time I start it up

Wait, I forgot,can't do this because I just dropped car off for new chain, guides, tensioner and tensioner guide. Will check when I pick car up on Wednesday.
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Old 01-15-2007, 08:30 PM
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Thanks! Much obliged.

Have them change my chains, guides, rails and tensioner as well while they are at it. LOL.
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  #4  
Old 01-16-2007, 05:15 PM
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Oxygen sensor light

86 & 87 420 SEL and 560 SEL have a circuit in the CIS-E control unit that turns on the O2 sensor bulb. The bulb should come on with key on and engine not running.
If the bulb does not light it has probably been removed.
Mike
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  #5  
Old 01-17-2007, 01:35 AM
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Thanks, but its a 1985 380SE.... not sure if they would be different from the 86'+ setup or not.

My "username" is from before. I have a 85' 380SE now. I suppose I should change my username, as many people often assume that I have a 86' 560SEL. I wish I did, but I don't.

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Originally Posted by 86560SEL View Post
its a 85' W126 380SE.
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2004 Toyota Sequoia Limited 4wd
1991 Lincoln Town Car Executive
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(Prior MB's: 1974 240D, 1985 380SE, 1984 190D, 1993 400SEL)
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  #6  
Old 01-17-2007, 10:19 AM
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If it was DESIGNED to never come on, how would you know the bulb wasn't burned out?

Of course it's supposed to come on. Who cares which model?
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  #7  
Old 01-17-2007, 11:20 PM
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I asked, because on some cars- not ALL warning lights are designed to come on when the ignition is turned on. I was not sure if this light on this car was one of those exceptions.

Who cares which model? It may not matter, but because of my username, I assume he thought that I had a 86' 560SEL, but mine has a different engine (3.8L) on the slightly older body style, so I did not know if that would make a difference or not. They changed quite a bit from 1985 to 1986 in many areas/updates. So there. Also, if it is supposed to come on and its not the bulb, I was wondering if there would be any other reason it would not illuminate.

Thank you.

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If it was DESIGNED to never come on, how would you know the bulb wasn't burned out?

Of course it's supposed to come on. Who cares which model?
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  #8  
Old 01-27-2007, 10:31 PM
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GARY - did you get your car back yet?
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  #9  
Old 01-28-2007, 04:58 AM
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yes I did and it runs great...I did turn the key on and my 02 light does not come on. This was about a week ago but I will check this out again and let you know.
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  #10  
Old 01-28-2007, 10:27 AM
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Just read the manual and the 02 sensor light will come on when sensor needs replacement. It does not come on when turning the key to position 2. The manual states that he oather gauges( ABS low fuel reserve, charging, etc do come on when ignition switch is turned to position 2
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  #11  
Old 01-29-2007, 09:00 PM
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Thanks Gare.... I never thought to look in the owners manual.

Seems like all is normal then, because all of my other warning lamps work properly.

Thanks again.

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Originally Posted by Gary Ganaway View Post
Just read the manual and the 02 sensor light will come on when sensor needs replacement. It does not come on when turning the key to position 2. The manual states that he oather gauges( ABS low fuel reserve, charging, etc do come on when ignition switch is turned to position 2

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