somebody can help me, I have 97 cherokee and the check engine ligth is turn on , odometer display shows next codes:
15 -- speed sensor signal no detected , where this sensor is located?? and how can I check if it's works.

21---U pstream o2 sensor and/or downstream 02 sensor , where those are located??

thanks for your help

somebody can help me, I have 97 cherokee and the check engine ligth is turn on , odometer display shows next codes:
15 -- speed sensor signal no detected , where this sensor is located?? and how can I check if it's works.

21---U pstream o2 sensor and/or downstream 02 sensor , where those are located??

thanks for your help
HI THE CODE 15 IS A SENSOR ON THE ANTI-LOCK BRAKE SYSTEM, NEVER MESSED WITH. CODE 21 IS THE OXYGEN SENSOR, AHEAD OF THE CATALYTIC CONVERTER OR BEHIND THE CONVERTER ( O2-SENSOR)
DALE jeepman600@aol.com :banghead: