[duffyatkinson]

Originally Posted by suissevale

Two months back I replaced the O2 sensor in bank one. I was just informed by Auto Zone that the sensor is gone again. My question, what is the downside of not replacing? I live in FL where vehicle inspections are not required.

Thanks in advance!

The Bank 1 sensors provide air-fuel mixture information to your vehicle's ECU. A failing/failed air-fuel ratio will allow the engine to drift from its stoichiometric balance point 14.7:1, overly enrichen the mixture, and ultimately will 1. burn out the rest of your sensors, and 2. damage your catalytic converters. The wrecked cats is where you get hit in the wallet.

What brand of sensor did you replace it with? Get them replaced as soon as possible. It'll cost you about $125 for both fronts and you can do the job yourself. I posted a detailed how-to on the procedure in another post here: http://www.tundrasolutions.com/forums/1197269-post2/

Good luck.