Originally posted by Eurythmian:
AutoZone said it's the O2 Sensor (Bank 1) on the passenger side which needs to be replaced. ( I have no clue! )



Standard answer from AutoZone...
I cannot think of a single post about getting codes read where the AutoZone guys did not say that. I'm beginning to think that AZ is owned by an O2 manufacturer or vise-versa.

You've got an older Contique, start looking/listening for leaks in your vac hoses & intake hoses. The accordian hose can sometime develope cracks, as can the rigid tubing & couplings on top of the UIM.

You may also need a new set of intake manifold gaskets - they get a bit less effective over time. Especially when some doofus grease monkey leans on the UIM while performing work on the car, like oil or plug change, or air filter change. The added stresses of a 200 pound guy leaning on the UIM would seem to be enough to push old gaskets beyond their limits, causing leaks.

Those are areas where I would start looking. Relatively simple to look & listen for hissing, can usually be an inexpensive DIY project.

Must be that jumbly-wumbly thing happening again.