Joined: Mar 2019
|D22 1997–2004 Discussions on the First Generation Frontier.|
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What is the best way to remove the pre cat on a 2wd 2.4l 5 speed XE Frontier, 2001 model.
Well, technically it's the primary or upstream converter, not a pre-catalytic converter. Difficulty usually depends on how rusty the flange nuts are, so a good soaking down of the bolts and nuts with rust
penetrant like P-blaster is recommended. The upstream converter has to be removed from under the vehicle, so long extensions with sockets are used to unbolt the flange nuts. You can either remove the post converter, first, and then the upstream converter...or, remove the upstream and post converters as an assembly after getting the pipe disconnected from the back of the post converter and remove it out of the way. It's all a matter of what method is easiest for you. Of course, unplug or remove the oxygen sensors, first. Make sure you get new gaskets.
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