I have a 1994 Volvo 850 turbo wagon. So I've been doing some pre-maintenance items. Here's what happened- I disconnected the air inlet hose to gain access to the dipstick to change the ATF. I then went for a little drivey to heat the fluid back up, and realized I did not clamp the hose back. So it came off and I barely made it back with the check engine light on. Pulled the code off OBD1 as a 121. I tried to reset it doing the hold down wait ten seconds twice with no luck in port 2 and 3. (I noticed the light did not came back on after the first hold down). It runs great but.... can you please help me kind Volvo masters!

Thanks!!