i had the head gasket replaced on my 2004 nissan frontier with the 3.3 v6. Within one month the 02 heated sensor 1 lean shift monitoring bank 2 service engine light came on. I paid 212 for the sensor from nissan and paid the mechanic to install it, 4 months later it kicked the same code and nissan replaced it under warranty and the mechanic ate the labor. Now 5 months after that it is kicking the same code> I have a hard time believing the sensors are going bad as this will be the 3rd time in a year and i have never until now had this problem with any vehicle i;ve owned, suggestions as to what the problem really is?/
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