My check engine light is on in my '93 850. I have tried to check the codes using the A2 port as I have done many times in the past but there are so codes stored, just 1-1-1. Does anyone know why this might happen.

 

I doubt this has anything to do with it, but my 2008 V70 just had the same thing.

I found the battery cable finger tight; not where it connects to the battery post, but where the harness bolts to the wye bracket 3 inches away. each 13mm capture bolt was finger tight. I also had a starter motor stutter a few times, which led me to suspect battery terminals.

No codes. Loose battery cables. Check engine light.

 

Check port A-6 as well.

...Lee

 

In Slade's case,
The check engine light can be ON from a code in A1 as well....Here is some info that may help:

The transmission can ask the check engine light to be turned on, so if you try clearing A2 codes and they wont go away try reading the transmission (A1), clear them , and then go back to A2.

A1 Transmission
B1 Climate Control
A2 Fuel System
B2 Cruise Control
A3 ABS
B5 SRS
A5 TCU (Transmission Control)
B6 Power Seat
A6 Ignition System
A7 Combined Instrument