After the check engine light came on again recently (it seems to come and go over the months) I decided to see if I could use the OBD codes to find out what's going on. I get three codes from socket two in this order: 2-3-1, 2-3-2, and 2-2-1. I get 1-1-1 from socket 6.

I'm looking at the chart and I don't know whether to use the LH2.4 or Motronic 1.8 column- I don't know what those mean, since I am completely inexperienced with Volvos and car repair in general.

Here's the complaint: rough idle, but no gas fumes or smells and gets about 20 mpg on highway. Not a big deal, accept a few times a year, mainly but not exclusively in the winter, I will be sitting at a traffic light on a slight incline and when giving it a little gas to start from the dead stop the car will stall, causing all the people behind me to start honking their horns...Not good for my anxiety levels.

I have checked fuses 4 and 6. The car has new plugs and wires. Never had any problem passing emmisions testing.

I don't know where the oxygen sensor is located- don't even know where the catalytic converter is located- inline with the muffler? At present I don't have ramps or any way to jack the car up other than the tire jack.

Could it be the throttle body? That would be easier to reach and clean...and I may do that this week at any rate.

Any help for this novice would be appreciated. 1992 Volvo 240 5-speed sedan.

Thanks,
Keith