Need help with Check Engine Light
03-04-2006, 08:59 PM
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Need help with Check Engine Light
The check engine light is on on my 1991 300SE. How do you read the codes out of the ECU and what equipment do I need. I'm assuming this car is pre-OBD so a scanner won't work. I'm new to MB but I do have a lot of experience working with fuel-injected cars. Any help would be greatly appreciated. Thanks!
03-04-2006, 10:56 PM
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1986 560SEL, 97 BMW 740iL
Maybe there is some vaccume leaks somewhere? Do you work on your own car or take it to a mechanic? I use a generic MB mechanic in town.
03-10-2006, 08:38 PM
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It's not a vacuum leak. I generally work on my own cars (I used to build turbo 4-cylinder engines and old american V8s). German engineering is soooooo different than what I'm used to. I figured out how to pull the codes and reset them, but I keep getting the light back on for the same thing. Apparently it's code 9 and 17 (O2 sensor and EHA voltage). I replaced the overload voltage relay to no avail. Please anyone help! 
