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Sorry to resurrect an old thread but I have similar problems.

Just installed the LTH's two weekends ago. Initially there was no CEL and I drove the car about 40 miles without issue. Then the CEL came on and stayed on and would not stay cleared. Eventually, 40 more miles later, the car started idling rough and would die after a couple seconds on start up. I had it get it towed to the shop. Our initial feeling is that the O2 sensors were wired wrong and that I had crossed the two black wires on one/both of the O2 sensors. Not knowing which sensor was the mistake, two new O2 sensors were purchased and very carefully the wires were spliced one by one (new wire was used for the splice. We did not reuse the wire provided by FI).

However, the car is still throwing codes P0053, P0300, and P2096 on the passenger side O2 sensor. Also, the passenger air/fuel sensor is reading 5v when it should be low to mid 2v. Could it be possible that crossing the black wires on the O2 sensor would have caused a short in the ECU such that the 5v source signal is not even reaching the O2 sensor anymore but is shorted in the ECU?

So, any suggestions? We have been told to reinstall the FI supplied splice wires back into the O2 sensors and will give it a try tomorrow. We rewired the new O2 sensors with new wire so we think it is strange that this cause the problem since only the passenger side is throwing codes and not the driver side as well.