Rep Power: 0

I was just gifted a 2004 Honda Civic coupe with only 28,000 miles on it (it was owned by an elderly person). I believe it is the value model.

It had a check engine light (code P0122).The previous owner said it needed a new throttle positioning sensor (TPS). It noticed when I first got it that it had a somewhat rough idle and was slow to accelerate between 20 and 30. I’ve been driving it for a few days.

But today, I didn’t notice any acceleration issues and the check engine light went off. Does anyone know if this is something I should still be worried about, or if the TPS can just kind of “reset” itself ?

Also, how can I tell if the throttle positioning sensor is the problem and not the throttle body ?

Thanks in advance for any info you can provide. Sorry if this is the wrong spot- new here.

 
Rep Power: 210

If you don't already own one you may want to invest in a cheap OBD2 Bluetooth live data scanner that works with an Android or Laptop such as this one:
That scanner should be able to read TPS data such as voltage output. You can also clear the code if it appears on the scanner and see if the code returns.

28k? That car will last you a long time. Timing belt is 75k miles or 7 years. It's past the 7 year mark so you may want to change it soon?