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| 09-03-2009, 05:35 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, 05:57 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, 06:37 PM | #4 |
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BimmerPost Supporting Vendor
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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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