Should I replace the o2 Sensor??

Hi,

I am sure this has been covered before but I could not find it in the old notes.

Autozone checked the service engine code and said it was the O2 code. He reset it and said it could be just an error that could have been caused by the recent hot and humid weather. It's a 98 TS Montana.

My questions are: if the code does come back is it worthwhile to replace the sensor, any benefits? What is the price? Is it as difficult to do as the rear spark plugs?

Thanks again in advance any help is greatly appreciated.

John

This is a Great Forum!!

Don't know about the difficulty, but it isn't uncommon for an older design O2 sensor to trip when you had humidity changes, or had a one-time irregular event that set a code. The newer calibrations are "smarter" and are able to know when to ignore a fault.

Don't know the price, but they do sell them at Autozone. A bad sensor can negatively affect fuel consumption, so if you know it is bad, replace it........good luck, glen

Price will be $70-90 after market. If you've gone 100k+ miles, just replace it. Or at a minimum watch your MPG. It's located on the rear of the engine just before the manifold attaches to the exhaust down pipe. You can get to it either from the top of the engine removing the ignition modules, or from the bottom through the gap between the floorpan and the exhaust pipe.

Thank You!