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Where is the 1994 Volvo 940’s OBD port located?
I bought a used 1994 Volvo 940 a couple of months ago and just today I saw that the “Check Engine” light had turned on. I was going to use an OBD scanner to check for error codes, but I can’t find the port anywhere. Where is the 1994 Volvo 940’s OBD port located?
Andrew Biro · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
The reason you can’t find your 1994
Volvo 940’s
OBD-II port is because it doesn’t have one—it wasn’t until 1995/96 that OBD-II ports would be added to vehicles, replacing the standard OBD-I system.Fortunately, retrieving diagnostic trouble codes from an OBD-I system is a fairly simple process and does not require any special tools or scanners, though it does take a little longer than you might be used to. Here’s what you need to do:
- Open your hood and locate the OBD-I connector unit(s). Look to the rear of the engine bay on the driver’s side and see one to two black rectangular boxes mounted in front of the shock tower.
- Remove the OBD-I connector unit’s case. On the face of the OBD-I connector unit you should see a button, probe, six sockets, and a light.
- Plug the probe into the first socket (electronic transmission), second socket (fuel injection), third socket (anti-brake lock system), or sixth socket (ignition system).
- Switch the ignition to the “ON” position but do not turn the engine on.
- Press the button once for at least 1 second and no more than 3 seconds.
- Watch the light and count the number of flashes. A 3-second interval separates each series of flashes, and there are three series of flashes.
- If the light flashes 1-1-1, there are no error codes stored for that socket.
To make things easier for yourself, we’d recommend searching online for a list of the 1994 Volvo 940’s error codes and their meanings.
View full answer
- Gregory R.
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