I've checked the forum for related topics on the check engine light and running the codes. There are so many different techniques, and year models that all I got was confused.

The question: Can the codes be checked on the 93 300E 3.2L without meters and testing equipment?. I was not able to find the codes list for the 93 300E. I did find codes for 93 300E 2.8L and 3.0L but I didn't think Mercedes made a 3.0 in 93.

Thanks for helping a rookie.

Chris

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Chris Rogers

Took the car to the Mercedes Mechanic this morning for him to check the "Check Engine Light". Needed to have the 60,000 service anyway. Anyone know the answer to the previous question about DIY checking the codes?

Thanks

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Chris Rogers

You have the 104 engine so you should be able to check the codes using the DM module. This module should be towards the passenger side of the car.

It is a small box. You can take the cover off, hold the button for 2-3 seconds and LED will flash to give you emissions code.

You can also build a tool to check codes for other modules like the HFM. Do a search on led/sw.

Key has to be in the ON position.

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Zafar
94 E320 58000 Miles

I have looked under the hood on the passenger side around the battery area and have not been able to find anything with a pushbutton or led's. Any other pointers? Thanks.

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Chris Rogers

The box you are looking for is right behind the battery. The box is small...........about two inchs long by three inchs wide. There is a plastic cap that covers the box which houses the diagnostic plug. Pop the plastic top off with your fingers and you should see a multiple pin connector. On the face of the connector is a little led/push button. With the ignition ON, depress the push button for 4 to 5 seconds and then release it. The button is actually an led and will begin to flash. Count the number of flashs, and then determine the fault that is associated with the number of flashs. When the led finishs a flashing sequence, once again depress the led/push switch for 4 to 5 seconds. If the led begins to flash, there may be a second code stored. If it flashs the same number of flashes as your previous try..........then you know that there is only the one code stored. If it flashs a different number of flashs....then you know that there are at least two codes stored. Continue to repeat the swtich reset sequence as above until you come back to the first code that you read.

The codes that can be read with the led are the only codes that will trigger you CHECK ENGINE light. Other fault codes for other problems are stored on the other pins of the connector; but, you will need the little LED tester that has been discussed on this board before.