Engine light with P0155 code

[Hambone]

I tried looking at other threads before starting this but it looked like all others cars had been modified.
Took a couple days off last week and really cleaned the Boss up with a wash/clay bar & wax. Of course as soon as I backed out of the driveway I noticed the engine light on. I drove it a couple hundred miles over the weekend to the Tehachapi mountains up by Bakersfield and could tell the power was down and it idled a little different. I had Pep Boys pull the code yesterday(P0155). I did some research and tells me it is the 02 sensor bank 2 sensor 1. Found it after jacking the car up and nothing looks obvious as far as loose. The car is completely stock except for a K & N filter. 55,000 miles of fun street driving with no track time. This is the second engine with the first tanking at 21k ( warped cylinder head warranty replacement).

Anyone else have the issue with a stock car this soon? From what I read they should last around 100k.

Anything else that may trigger this besides the sensor?

I will probably just buy 1 and replace it. Not cheap though. Just hope the other 3 don't decide to give up.

 

[big red one]

I had the same, theres a lot of stuff on her in the powertrain section, you can read all about it, I had the code once, cleared it and its never come back YET