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      09-03-2009, 06:35 PM   #1
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Secondary Cat Delete

If the secondary cat is deleted will it throw a CEL code??
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      09-03-2009, 06:37 PM   #2
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      09-03-2009, 06:57 PM   #3
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No, because the rear O2 sensors are directly behind the primary cats (i.e. well in front of the secondary cats) so removing the secondary cats will have no effect...
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      09-03-2009, 07:37 PM   #4
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Here's a visual reference to what the others are stating:



The 02s in the system are specific to the front cats only.
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