Code P0138

jdc

Newbie
Joined
May 16, 2007
Messages
3
Points
0
98 Jeep Cherokee, 6 cyl, 86000 miles

My CEL came on yesterday and is reading a code of P0138. Since I have otherwise had no other problems, (and no other codes present) how likely is it to be just a faulty O2 sensor? Anything else I should check first? I figure I can replace an O2 sensor quickly and easily by myself. If I need to do much beyond that for I will probably end up going to a mechanic.
 

kev2

wrench
Joined
Nov 14, 2006
Messages
4,919
Points
48
Age
119
I always ask.....vehicle is stock no modifications, add ons or aftermarket parts??

P0138 (M)
O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
Oxygen sensor input voltage maintained above normal operating range.

Often an internal sensor problem with heater side of sensor, recomend you also check the harness for any evidence of shorted, damaged or pinched wiring.....
good luck let us know outcome ...
 
Top