My 95 850R ran a little funny going home yesterday. Had my friend put his OBDII tester on it and these are the codes that came up. Any help with explanation would be great.
P0500 - speedometer signal
P0172 - longterm fuel trim, part load, long term fuel trim idling
P0102 - Mass Air Flow sensor, signal.
THanks to all

 

P0172 and P0102 First check really good for a vaccum leak.If there is none then look at the mass flow sensor.

P0500 might be the engine speed sensor or the trans speed sensor.

I would take care of the 172 and 102 and clear the clodes and see if the 500 comes back.

 

Thanks Tech. You're the best! I will do that. I called my mechanic this morning and told him the codes. He said he would look at the P0500 and P0102 first. If those get taken care of, he thnks the P0172 will go away.

 

The P0172 means there is a vaccum leak in the system.That will cause the P0102 code.

The P0500 might be from a bad speed sensor or something like that but I doubt related to the other codes.

 

Tech - The vacuum leaks were fixed and those codes went away. After about 10 days since codes were cleared, the hesitation is back when car is trying to downshift. Could it be the throttle postion sensor?

 

Could very well be possible.