In a previous thread I had an 870 coded being thrown. I changed atf and filters but it's still here. Since I was running ORM I also have code 102. I plugged the maf connector back in and the check engine light went out but my code reader stills shows 102 and 870. I'm trying to get to where I just have 870 showing and then take it to the dealer. How long before it will clear the 102 code?

For "Most" OBDII computers to clear the codes themselves, it usually takes 1 or 2 "Drive Cycles." A drive Cycle is when the engine goes from cold-to hot-to cold.

The computer watches the water temp for this input.

Hope this helps.

If the system stored it as a history code(no MIL light on) it can take from 50 or more drive cycles.

Well it's been way more than a couple of cycles but not 50. Strange thing is if I let my reader clear both codes the 870 code won't come back until I pull the maf plug. They can't be related. 870 is a transmission code. It tried clearing all codes and then running non-ORM but got no codes. I then pulled the plug and now I have both.