1992 500SL OBD location
 

Where is the OBD physical location on a 1992 500SL , california car.:confused:
My 1992 300E had an OBD located next to the battery.

No OBD on pre 1996, only a proprietary MB diagnostic connector.
 

No OBD on pre 1996, only a proprietary MB diagnostic connector.



Points to check when buying a UK 91-95 SL500
http://www.peachparts.com/shopforum/mercedes-benz-sl-discussion-forum/65125-points-check-when-buying-uk-91-95-sl500-post402277.html#post402277

Is it possible to pull any codes out of this MB propietary connector?

It is OBDII that became a requirement, in 1996. Before that there was OBDI which is on this car. And actually quite a few cars adopted OBDII early in 1994 and 1995. This car was right on the break between a 16 pin connector and a 38 pin connector both of which would be located in the rear passenger side of the engine compartment. If it's a 38 pin it would be covered by a round black plastic cap. In either case you can read codes with Arthur Dalton's code reader - you will find plenty with a search.

After I pulled the plastic cover :confused: near the firewallI am not able to see any OBD, any ideas?

any responders that actually know if a obd exists in this car and where is located?

Answer.
 

code reader info
http://www.peachparts.com/shopforum/tech-help/144773-early-16-pin-code-reader-info.html

Jim Forgione's DIY articles

On-Board Diagnostics (OBD) scanner tools for MBZs... & VWs too!
http://www.peachparts.com/shopforum/diesel-discussion/167086-board-diagnostics-obd-scanner-tools-mbzs-vws-too.html

Clearly you have either a 16 or a 38 pin diagnostic connector. The Baum manual shows a 92 500SL (129.066) as having a 16 pin connector so that's probably what it is. It is probably covered by a black plastic cap and it should be in the rear of the engine compartment on passenger side. Perhaps if you posted a picture someone could spot it.

Although written for a W140, much of this applies to your car as well...

http://v12uberalles.com/pulling_codes.htm