[irox]

31 is the Throttle Position Sensor - I've not had to deal with or replace an SVX TPS before so can't really give you advice there. Maybe search the archives for info on impact of it failing, how to test it, how

As for the MAF, do you know it's a good MAF? Has the car ran with it yet? Did you replace it with a brand new factory MAF (~$400) or a junk yard one? Could it have been damaged during installation (they seem rather delicate). I as I said in the other thread, I tried three MAFs before figuring out it was the MAF connector that was going bad. You could try wiggling the connectors/wires, make sure everything is seated correctly, etc..

If the car hasn't ran since you replaced the MAF, then that could be an old error code from before it was replaced.

Good luck,
Ian.