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What do these codes mean?

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NAXJA Forum User
Location
Cincinnati, Ohio
Went to Autozone for my problem I keep having with my 97 XJ 4.0. I already have replaced both O2 sensors and reset the computer but today the check engine light came back on so I took it to get it checked out.

The computer spit out two codes, 135 and 141.

135 Reads:

The pcm has determined that a malfunction exists in the heater circuit for oxygen sensor 1 in bank 1 (pre-cat).

141 Reads exactly the same thing, except for the post cat O2 sensor.

What gives? Am I missing something? They are brand new and I unhooked the battery for 30 mins or more.

Need some help big time.

Thanks,

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