I drive a 2009 Sante Fe with about 36000 miles on it. I had the tranny serviced in 01/11 and since then I keep getting the code P0131. It's been to my dealer three times with this and still isn't fixed. First they said it might have been a dirty injector but this thing runs smooth and strong, then they replaced the purge cylinder valve on visit number two. Number three was a disconnected vacuum line off the main air duct and it is there right now four their number four attempt. I've had other issues with this vehicle but they all seem to have been corrected. I'll post the findings from today's service when I pick the thing up.

 

P0131 is the code for low voltage on the #1 O2 sensor on bank 1. It very well could be a bad injector or just a bad O2 sensor.

 

The dealer called and said it's a bad O2 sensor. They'll have the part tomorrow so we'll see if it takes care of the code.