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Old 05-19-2003, 05:15 PM
Randy L
Posts: n/a
Accessing compuer codes

Hey All,
Being a new MB owner (well, newly purchased '96 C220) is there a link to where I can find out how to access/retrieve computer code readings? I do most of my own repairs, but won't attempt to tinker with the Benz until I am familiar with the ins-&-outs of this fine car. I tried searching this site but no results. Any tips to know about the C220 or similar models would also be appreciated.
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Old 05-24-2003, 11:50 PM
Registered User
Join Date: May 2001
Location: Las Vegas, Atlanta
Posts: 669
I know very little about this...

But I can tell you that you probably need a specialized diagnostic tool to retrieve codes since your car is OBD II. Steve Brotherton wrote a great article about engine diagnostics in the D.I.Y. section. You should check it out.
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Old 05-25-2003, 08:00 AM
KenP's Avatar
Registered User
Join Date: Dec 2002
Location: Southern New Hampshire
Posts: 418
Here's one choice...

Congratulations on your newly acquired C220. As mentioned, you have the OBD-II system for emmisions related diagnostics. This was mandataed by US federal law for all cars sold in the US from '96 up.
This is good news (in my opinion). You can read most of the engine and transmission related codes yourself for very little money.
The OBD-II electrical interface is located beneath the dash on the driver's side. All you need is a scanner to read this data.
Most dedicated scanners are expensive.. fortunately, in this case, there's a better way.
Try this link:

I bought this interface box from this guy and it works great. His site is pretty self explanatory. You download the software from the site, plug one end of the interface into your car and the other into your laptop... and bingo, you're in. It works great on my '96 S500.
One advantage it has over simple "scanners" is that it allows you to see the data as a "stream" and will plot the O2 sensor and fuel trim in real time. This is really helpful if you're chasing a "lazy" sensor that takes a long time to come on line.
Anyway, I'm sure others have good solutions and they will post here, but I use this simple (and inexpensive) OBDII interface on all my cars (both foreign and domestic) and it works terrific.

This will not let you access Mercedes specific code digital data for non-engine/transmission systems. You do need a specific (and expensive) scanner for that.
Good luck, hope this helps, KenP
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Old 05-25-2003, 03:36 PM
Registered User
Join Date: Dec 2002
Location: Houston
Posts: 131
I have gone to the local Autozone store, and they'll read the code for me.

98 E300D
89 300SE
84 300SD sold
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