Is the meter you saw the letters “ODB” used to read the codes for this car? Are you now sure this car has an ODB system? The plug is usually within 3 feet of the steering wheel. Don’t know the specific location for this car. Could also be hidden by the carpet, behind an ash try or in other locations. It must be accessible to allow the reader to plug in to it.
If you have a pre-ODB system also look in the engine compartment for a small rectangle plastic black box (as least on USA cars). There is a cover that pops open revealing a number of electrical terminals.
You may have EOBD, the European Union variant of OBD-II. This was mandatory for gasoline vehicles sold in the European beginning in 2001. Don’t know if your car has this.
The USA version is called OBD II. The port connector is called the Data Link Connector (DLC). It is a 16-pin plug usually located under the dashboard near the steering wheel. The USA standard specifies the connector must be within three feet of the driver.
The link below provides information on the USA locations of the plug.
http://www.obdclearinghouse.com/oemdb/
If you have ODB, you will need to find the plug, plug in the meter and use the meter to clear the codes. If you have an older system you may be able to clear the codes by jumping 2 terminals in the small plastic box