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Old 06-10-2009, 04:55 PM   #1
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New Muffler Help

Will putting a new flowmaster muffler in trigger the check engine light? I'm only swapping the old muffler for a new flowmaster muffler not the whole exhaust system. Its an 09 4.0l V6 double cab. At the garage I stopped by at the guy told me changing mufflers would trigger the check engine light and cause other problems. Is this correct?
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Old 06-10-2009, 04:57 PM   #2
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No the only way it will throw a code is if you remove emission parts from your exhaust system and the muffler is not an emission part.
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Old 06-11-2009, 04:58 PM   #3
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So I should have no problems with the engine running lean and triggering the light?
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Old 06-11-2009, 05:00 PM   #4
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no u will not have problems.. the 02 sensors are way before ur muffler, so ur fine, you will not throw a code
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