P0138

[jeepcreeper64@hotmail.com]

ok im currently working on my gfs mothers infiniti QX4 and i put my code reader on and showed up p0138 and p0139 so i replaced the o2 sensor on the driver rear but then she went on a drive and the check engine light came back on and i put my comp and reads p0138 again so im not sure if i change the wrong o2 sensor or not so if you guys can help me that would be awesome thank you

[jebhott]

when u get a 138 you need to replace both rear o2 sensors and check ecm part# some 2000 have updated part# for ecu

[IlovemyFX]

You can check the P/N's and get additional information on this problem by checking ITB01-045a on this page:

http://x.infinitihelp.com/forum/loca...d&pp=12&page=3