O2 sensor resistance behind cat - Duramtric reading
 

I was doing some diagnosis with a Durametric to solve my Engine light issue.
Getting codes P1126 and P1133.

In doing so I was looking at the o2 sensor resistance before and after the cats while idling.

3 of them read 0 and one on bank 2 after the cat read 64.

Do they have to heat up for a while before giving a reading other than 0 or does the one with 64 mean there is an issue with that sensor?

I cleaned the MAF and codes and they stayed away for one whole day but now the light came back on, although the car still runs smoothly.

I did replace the before cat sensors a year ago.

From a thread you made.

<iframe width="640" height="360" src="//www.youtube.com/embed/5WnM_NsOtd8?feature=player_detailpage" frameborder="0" allowfullscreen></iframe>

If it's not your O2 sensors, then it's most likely your MAF sensor.

Fault code 1126 & 1133 - 986 Series (Boxster, Boxster S) - RennTech.org Forums