u/Interesting_Sir_3543

I recently had a bunch of work done to my 2008 Xterra. It’s only got 155,000 miles..

I had the fuel injectors done, fuel lines cleaned, brakes flushed, new clock spring, did the transmission bypass to the trans cooler. I started to get check engine light for my mass airflow sensor so I cleaned that and it was fine for a while but then my O2 sensor bank one upstream started hitting the code and giving me the check engine light.
I ordered the parts and it’s gonna be here Tuesday or Wednesday and magically for the last three days the check engine light went off. It’s no longer reading that error code. When the check engine light came on for my O2 sensor, I had two incidences where the engine almost misfired or tried to stall then corrected itself and it hasn’t been an issue since and like I said the O2 sensor light is off.

Is it possible it recalibrated or something? I still plan on swapping it out when the part gets here and I’m gonna go ahead and do the crankshaft sensor as well but yeah, I thought it was super weird.

2008 Xterra 2nd owner..153,000 miles.
I recently had a bunch of work done, including tuneup, new spark plugs, and cables, valve cover seals, fuel injectors replaced, fuel line cleaned with new filter, new brakes, and rotors, new tires, new clock spring with arm controls, mass airflow sensor cleaned.. I recently had my transmission lines removed from the radiator and fed through the trans cooler till I can replace the radiator.

I’m slowly trying to fix the small problems before they become big. Every time I fix one error code another one pops up. I’ve only had one error code each time. Now it’s P0133. 02 sensor - bank one - passenger side.

I’m looking for a good replacement. I see a bunch of cheap junk on Amazon and wondering if there’s any brands like Denso but maybe cheaper? I only need the one..