XK8 / XKR ( X100 ) 1996 - 2006

2003 heater hose leak

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Old Apr 22, 2026 | 04:43 PM
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Default 2003 heater hose leak

There is a hose that looks to be a heater hose near the right side O2 sensor in the photo that is leaking at the joint to a hard pipe. I am not sure hw this is clamped to the pipe but am wondering if there is a solution other than replacing the heater hose which looks to have multiple sections and is probably quite expensive.
Can I somehow remove the existing clamp and use a regular hose clamp? Not sure how this existing clamp even works
I am sure others have dealt with this before.
Thanks

 
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Old Apr 23, 2026 | 05:18 AM
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That is the infamous octopus heater hose. That's a normal clip. Yes, you can cut that out and replace with a regular clamp. I would still do the hose because it's likely on it's way out.

The hose part number is: MJA6728AC

OEM is $355, aftermarket is $270 on SNG Baratt. A silicone hose replacement is available from Swallow's Racing for £172.
 
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Old Apr 23, 2026 | 06:46 AM
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^^ +1
Consider also replacing the valley hoses, although that's a bigger job
 
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Old Apr 23, 2026 | 07:31 AM
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Thanks @giandanielxk8 Now to figure out how to remove the existing clamp and so I can put on a regular hose clamp temporarily to move the car.
I ordered a new hose but need a temporary fix.

@michaelh Not sure what a valley hose is nor what is needed to replace them. Care to educate me? THanks
 
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Old Apr 23, 2026 | 01:28 PM
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Originally Posted by Pantera928
Not sure what a valley hose is nor what is needed to replace them. Care to educate me? THanks
The valley hoses (there are two) run from the octopus to the front of the engine. They run underneath the air intake manifold, hence that has to come off
There's also a tee piece on the LHS octopus connection that is biodegradable plastic. It's a good idea to replace that also - part # NNE3944BA. It's one of the few parts that are cheap ~$5.

If the octopus is failing, these parts may well also be ageing out.
 

Last edited by michaelh; Apr 24, 2026 at 03:38 AM.
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