Removing pre catalytic converter on XE 2wd - Nissan Forum
D22 1997–2004 Discussions on the First Generation Frontier.

 
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post #1 of 3 Old Mar 13th, 2019, 09:00 AM Thread Starter
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Removing pre catalytic converter on XE 2wd

What is the best way to remove the pre cat on a 2wd 2.4l 5 speed XE Frontier, 2001 model.

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post #2 of 3 Old Mar 13th, 2019, 10:44 AM
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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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post #3 of 3 Old Mar 13th, 2019, 11:13 AM Thread Starter
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Quote:
Originally Posted by marsh9`9 View Post
What is the best way to remove the pre cat on a 2wd 2.4l 5 speed XE Frontier, 2001 model.
Quote:
Originally Posted by smj999smj View Post
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.
Yes, thanks. The entire exhaust system has been replaced except the UPSTREAM converter..The flanged nuts all look good but I did round one so I became reluctant to proceed further until I received some advice.. I was going to remove the manifold, only the ERG tube may be a problem. All the manifold nuts loosen up very easily after lubricants were used. I will try again with first suggestion.
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