check engine light 94 E420
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Newbie
Joined: Aug 2005
Posts: 22
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From: Missouri Ozarks
1994 E420
check engine light 94 E420
Check engine lite comes on frequently. I have been shutting it off for some period of time by taking the neg terminal of the battery off for a time. I have been reading about the code reader under the hood on the right side. Most people talk about a 16 pin connector. Mine has an 8 connector plus an
LED and button. With the key on, If I hold the button for 4 seconds the LED is on, when I release the button the LED doesn't blink at all, even though the Check Engine Light is on! I have changed the 02 sensor. Can someone please shed some light on this 8 pin connector, and how to clear fault codes with it?
Many Thanks,
Bill
LED and button. With the key on, If I hold the button for 4 seconds the LED is on, when I release the button the LED doesn't blink at all, even though the Check Engine Light is on! I have changed the 02 sensor. Can someone please shed some light on this 8 pin connector, and how to clear fault codes with it?
Many Thanks,
Bill
MBWorld Fanatic!
Joined: Oct 2004
Posts: 5,816
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From: Orange County, CA
W124's
I have the same problem as you but I just take out the negative terminal as well.
I did it a couple days ago and it hasn't come back on since. It's nothing my mechanic has noticed either.
I did it a couple days ago and it hasn't come back on since. It's nothing my mechanic has noticed either.
MBWorld Fanatic!
Joined: Dec 2006
Posts: 1,042
Likes: 1
From: Bellevue, NE
1995 E320 SE, 162,000 Miles (Sold) 2007 CLK350 Cabriolet 2014 ML550
Check engine lite comes on frequently. I have been shutting it off for some period of time by taking the neg terminal of the battery off for a time. I have been reading about the code reader under the hood on the right side. Most people talk about a 16 pin connector. Mine has an 8 connector plus an
LED and button. With the key on, If I hold the button for 4 seconds the LED is on, when I release the button the LED doesn't blink at all, even though the Check Engine Light is on! I have changed the 02 sensor. Can someone please shed some light on this 8 pin connector, and how to clear fault codes with it?
Many Thanks,
Bill
LED and button. With the key on, If I hold the button for 4 seconds the LED is on, when I release the button the LED doesn't blink at all, even though the Check Engine Light is on! I have changed the 02 sensor. Can someone please shed some light on this 8 pin connector, and how to clear fault codes with it?
Many Thanks,
Bill
Senior Member
Joined: Mar 2007
Posts: 268
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1992 190E 2.6L
Error Codes Link
http://www.mercedesshop.com/shopforu....php3?t=107630
It should have more than one to check, not to assume that every code is exactly the fix, it takes time to troubleshoot. I've replaced everything a code once told me and it wasn't the problem at all, sometimes it can be an oxygen sensor or vacuum pressure, or just about anything...
Use it as a guide to start your troubleshooting. After an engine rebuild, it was gone for over month, but it came back, and my mechanic still can't find it either.
Good Luck!
It should have more than one to check, not to assume that every code is exactly the fix, it takes time to troubleshoot. I've replaced everything a code once told me and it wasn't the problem at all, sometimes it can be an oxygen sensor or vacuum pressure, or just about anything...
Use it as a guide to start your troubleshooting. After an engine rebuild, it was gone for over month, but it came back, and my mechanic still can't find it either.
Good Luck!
Last edited by jgajito; Feb 28, 2008 at 01:51 PM.
Member
Joined: Jun 2008
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TBD
can someone post of a pic of where exactly on the right side i should look for the LED and button to diagnose a check engine light? I looked around under the passenger side hood near the battery of my '93 300CE but didn't see anything similar... I think it was just the OVP and something else (no LED tho)...
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Member
Joined: Jun 2008
Posts: 83
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TBD
I've seen posts from members with pre-'93 w124s reading fault codes but not clear if its via home-made code reader or through a built-in system... Also, have read some posts referring to reading codes from somewhere on the driver's side under the hood vs. passenger side. In any case, some pics of exactly where to look would be helpful..
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Member
Joined: Jun 2008
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TBD
hmm, description of exactly where? I looked around but didn't see anything that could resemble an LED + button setup in the passenger side engine compartment. Thanks
Member
Joined: May 2007
Posts: 202
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From: Little Rock, Arkansas
1995 E 420
sorry cant post a picture right now, but it should be by your 38 pin connector. it'll have a cap over the top of it so its not visible to the eye you just got to look around.. you'll know when you find it! you'll see white numbers either 1- 8 or 1 - 16 i'm not sure for a 300ce and the led light!
