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Originally Posted by J. M. van Swaay
I have a 1994 E320 wagon with check engine light on. Shop reports MB fault codes 35 and 84 and suggests new air flow sensor and/or O2 sensor.
Is it possible to make modify or buy a code reader for this make and model so I can read my own fault codes?
J. M. van Swaay
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I don't show DM codes going higher than 50! Also don't show code 35 for a 124.032/052 car?????
You should be able to read the codes yourself: you should have a push-button/LED sw combo near the battery. Check my page, Menu#2 for what it looks like: called "X11/21sw" in the diagram.
With that sw/LED you can read codes from the Diagnostic Module. To read codes from the other ECUs in the car, you will need to build or buy as scanner.
The scanner shown on my page, MENU#3 shows a Mercedes compatible scanner that does all that you want. However, it's not cheap.
On the bottom of Menu#2 page, you see plans for a DIY code reader that can be built from Radio Shack parts. It will allow you to read codes from the other ECUs in the car. And, of course, it's cheap. But you need soldering and some construction skills.