Engine Check Po 715 And Po 705 Codes

FOR THE LAST 3 MONTHS I'VE BEEN DRIVING AND I'LL NOTICE AN ENGINE CHECK. THINKING IT WAS MAYBE A FILL UP CAP TWIST PROBLEM. BUT FOR THE LAST TWO MONTHS I'VE NOTICE WHEN I RECEIVE AN ENGINE CHECK I NOTICE THAT MY RMPS ARE HIGH FOR THE SPEED I'M GOING. BUT LATELY I WAS LEAKING TRANSMISSION FLUID. THE SEAL WAS REPLACED WHERE THE AXLE GOES INTO THE TRANSMISSION. BUT STILL I'M GETTING AN ENGINE CHECK. NOW THE ENGINE CHECKS MORE OFTEN. AND WHEN IT CHECKS THERE IS A LURCH. THIS CHECK HAPPENS 3 TIMES A WEEK. TURN OF THE ENGINE AND DRIVE AGAIN AND IT’S FINE.

I HAD THE ENGINE CHECK INTERPRETED. AND HERE IT IS:

P1525 MANUFACTURE SPECIFIC

PO715 INPUT SPEED SENSOR

PO705 TRANSMISSION RANGE SENSOR CIRCUIT

MY TRANSMISSION FLUID IS CLEAN. NO BLACKENED AREAS AT ALL.

SHOULD I BUY WARENTY PROTECTON? WHAT WOULD A HYUNDAI SERVICE CHARGE? or even better I read in another post that the input or output speed sensor(are they the same sensor?) can be found under air filter and costs fron 70-100. Anybody have the cost of the range sensor or where its located and how to work with it ?

Thanks