When to replace o2 sensors

Originally Posted by Z_ealot

What if they're just starting to fail and have not failed completely? I've replaced the map sensor as the previous one was a nice golden brown color on the sensor circuit itself and both maf sensors are reading good air flow....both post cat o2 sensors are reading within spec from the readings im getting from them, replaced fuel pump with new as the one that was in the fuel tank had become detached from its mounting poles. Running out of ideas as to why im getting the slight hesitation when i go wot


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