p0134 after downpipe install

Days after my downpipe installation was going good, my afr was fine, no check engine, and during the process of getting tune about a week later, i got a check engine and then my acessport stoped reading my afr and was stuck at 14.85. could it be an exhaust leak or a defective o2 sensor. Thanks in advnace.

 

It's more likely the connector is loose, those things kinda suck. Double check that they are seated. It will be two plugs for the primary O2.

 

did you ever resolve this? currently having the same issue after doing a catless downpipe install on my speed3.

if the connections are good, and there are no pushed put terminal pins, do you thing replacing the o2 sensor will fix this? have the same issue after replacing my downpipe with a catless one.

 

Had the same issue, turned out that the ceramic in the o2 sensor was damaged after removal and installation in my DP. put a new o2 sensor in from NTK and let the vehicle run for a min, AFRs changed. so far the new o2 sensor is working properly and no issues. hope this helps.