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  #1  
Old 08-04-2016, 01:35 PM
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Checking a check engine light

What's up fellas recently I have been having my check engine light on my 1990 300e (obd1) come on then back off withing about 30 seconds it's only happened about 3-4 times but I'm curious to what it is is there any,at home diy I can do to check the code ? Also will the codes come up even if the light isn't on anymore ? Thanks in advance.

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Last edited by daphatch; 08-05-2016 at 03:40 AM.
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  #2  
Old 08-04-2016, 10:28 PM
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inherent with the ODBII protocols, it should store transient codes so as not to
keep false positives. so head to your neighborhood auto parts store as many
will check the code for free. if you're game, you may want to pick up your
own reader just to have. the most basic are very inexpensive, with pricier
ones offering more features or probe for more sensors/codes beyond the basic
ODBII codes
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Last edited by raymond~; 08-04-2016 at 11:30 PM.
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  #3  
Old 08-04-2016, 10:57 PM
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I have one of these and the Tourque app.

Mini ELM327 Bluetooth OBD2 Car Diagno...

Super cheap and and can provide a lot more info than a cheap reader.



If your car is pre-OBDII here's a link to CEL codes and how to check them:

Mercedes – OBD Trouble Codes
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  #4  
Old 08-05-2016, 03:42 AM
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Quote:
Originally Posted by raymond~ View Post
inherent with the ODBII protocols, it should store transient codes so as not to
keep false positives. so head to your neighborhood auto parts store as many
will check the code for free. if you're game, you may want to pick up your
own reader just to have. the most basic are very inexpensive, with pricier
ones offering more features or probe for more sensors/codes beyond the basic
ODBII codes
Local parts stores only scan obd2 for free and not obd1

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  #5  
Old 08-05-2016, 07:47 AM
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OBD 2 was for '96 and later. There is a homemad code reader solution with LED's for some of the 124's and similar age MBs described somewhere in the dusty shelves of this forum.
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Old 08-05-2016, 03:26 PM
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Quote:
Originally Posted by daphatch View Post
Local parts stores only scan obd2 for free and not obd1

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ohhh, i misread the OBDI while reading it on my phone. aging eyeballs. tnx
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Old 08-05-2016, 04:09 PM
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Quote:
Originally Posted by raymond~ View Post
ohhh, i misread the OBDI while reading it on my phone. aging eyeballs. tnx
Lol it happens.

Can anyone tell me if the obd1 stores codes ? My check engine light isn't on anymore but I would still like to know what it came on for.

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  #8  
Old 08-05-2016, 06:25 PM
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the challenge with OBD-I is that the application followed no clear standard other than
guidelines and minimal requirements. this allowed each manufacturer to use the port
with some differences. so the question, I believe, might include whether Mercedes
designed storage for their vehicles to include storage of information and/or in what
manner to help with diagnostics? I've not been able to find anything after browsing
OBD history and development for the past hour.

You may also want to include checking with the lads over on Euro MB forums may have
insight, e.g. MB UK
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  #9  
Old 08-06-2016, 11:26 PM
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**UPDATE**

I figured out the pattern for the check engine light to turn on. It will come on after the car has been idling for more then 5 min but once I accelerate it will shut off right away. Has this ever happened to anyone ? In the process of getting a obd1 reader

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