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Discussion Starter #1
just what does the engine warning light do....

i'm asking because mine no longer works. as when i had the cat removed, the light came on. so the benz dealer said it was directly related to that....so he removed the bulb.

now..this was like back in 1993/4.....

nothing has happened....so should i do something about it or leave it as is.
 

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190E, SLK350
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Well, the light was on because when you removed the cat you probably permanently disconnected the O2 sensor; so your mechanic simply removed the light bulb. The problem now is that light is supposed to also indicate if there are other problems. Typically the light is just a flag to tell you that you need to run a dignosis (for recent vehicles OBDII). Problems like missfire, ignition and many others may not be caught because of your configuartion.
 
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