Contour Enthusiasts Group Archives Forums Modifications Duratec Maintenance Replacing precat O2 sensors

Are they pretty easy to get to underneath the car??? I'm throwing a CE for it and thinking about putting on the spark plug non fouler mod this weekend. Has anyone tried to replace the plugs before and what is the difficulty?

The ones up top are tougher than the lower ones. What's the fault code?

Just hope you aren't doing upstream bank 1. F'n PITA to get to. And WTF is a spark plug non fouler mod?

It's a mechanical-MIL. If you gut the recats, you put them between the lower O2 and the bung in the recat (or header). I don't know if this guy realises that's what it is for, hence why I asked what his codes were so I could see if there was any point to him doing that mod.

There isn'ty such a thing as a pre-cat O2 sensor.

You have upstream (used for fuel trim control) and downstream (used for catalyst monitor) O2 sensors.

The MIL-eliminators (or non-foulers) can only be applied the the downstream sensors. The upstream ones are mandatory for proper engine operation.

Steve

oh okay, from what i was gathering the top 02 senors on the exhaust manifold was the precat 02 sensors.

So the emissions ones are the ones on the Y pipe???

2 O2 sensors on the manifold for fuel contorl and 2 on the Y pipe for cats??