Quote:
Originally Posted by mlee
Carbon build up around fittings is sometimes very normal. You probably see some of that further back on connections as well.
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With those types of clamps it can be, however the problem is if the 02 sensors are very sensitive then you don't want any carbon build up / leaks around that area, otherwise a CEL is inevitable.
The only option may be to use a high temp exhaust sealant.