i have a 98 se 5 speed

i got 3 codes from my CEL these are the codes i got

07 07 0707" which points to the rear Oxygen Sensor.

10 03 PARK/Neutral Position Switch

05 10 >> 0510 points to a problem with the Rear Heated Oxygen Sensor

now i know i need a rear o2

but whats with the park neutral switch ? my car is a 5 speed manual

do they still have one ? if so where is it ?

or u think previous owner put an auto ecu in , but if he did , should it throw more codes

if my 5 speed maxima has this switch , where is it ?

car has always been a 5 spd manual car

any advice on this or opinions would be apprecited

thanx