Catalytic Converter Gasket
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Joined: Jul 2010
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From: Salem, OR
Catalytic Converter Gasket
My '07 XK has been emitting a intermittent PO00171 code, indicating left bank fuel lean.
More likely it is an air leak. It acts more like an exhaust leak - code pops at low speeds/high vacuum and does not pop at sustained highway speeds. My guess, at this point, is an exhaust leak where the catalytic converter mates with exhaust manifold.
Checking Jaguar parts fiche for exhaust system I do not see a part for a gasket between the cat and exhaust manifold. Does this mean it is a gasketless connection? Is the "fix" merely tightening mounting bolts? Would an aftermarket cat gasket be advised?
If there is a gasket, what is the part number?
Thanks for your advice.
More likely it is an air leak. It acts more like an exhaust leak - code pops at low speeds/high vacuum and does not pop at sustained highway speeds. My guess, at this point, is an exhaust leak where the catalytic converter mates with exhaust manifold.
Checking Jaguar parts fiche for exhaust system I do not see a part for a gasket between the cat and exhaust manifold. Does this mean it is a gasketless connection? Is the "fix" merely tightening mounting bolts? Would an aftermarket cat gasket be advised?
If there is a gasket, what is the part number?
Thanks for your advice.
Senior Member
Joined: Sep 2012
Posts: 420
Likes: 78
From: Chicago West Burbs
I am not sure about the gasket but this thread from the X100 forum dealt with this issue and may be helpful...including suspect gasoline from a certain supplier!
https://www.jaguarforums.com/forum/x...es-mean-88451/
https://www.jaguarforums.com/forum/x...es-mean-88451/
Joined: Jan 2012
Posts: 6,068
Likes: 2,983
From: Newport Beach, California
My '07 XK has been emitting a intermittent PO00171 code, indicating left bank fuel lean.
More likely it is an air leak. It acts more like an exhaust leak - code pops at low speeds/high vacuum and does not pop at sustained highway speeds. My guess, at this point, is an exhaust leak where the catalytic converter mates with exhaust manifold.
Checking Jaguar parts fiche for exhaust system I do not see a part for a gasket between the cat and exhaust manifold. Does this mean it is a gasketless connection? Is the "fix" merely tightening mounting bolts? Would an aftermarket cat gasket be advised?
If there is a gasket, what is the part number?
Thanks for your advice.
More likely it is an air leak. It acts more like an exhaust leak - code pops at low speeds/high vacuum and does not pop at sustained highway speeds. My guess, at this point, is an exhaust leak where the catalytic converter mates with exhaust manifold.
Checking Jaguar parts fiche for exhaust system I do not see a part for a gasket between the cat and exhaust manifold. Does this mean it is a gasketless connection? Is the "fix" merely tightening mounting bolts? Would an aftermarket cat gasket be advised?
If there is a gasket, what is the part number?
Thanks for your advice.
What are LTFTs and STFTs? They are a good indicator of what is going on, so post them here.
By 'parts fiche' I assume you mean the JEPC? The exhaust downpipe and catalyst is a taper fit with the exhaust manifold and does not use a gasket or seal.
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