Thread: Loss of power
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      11-28-2012, 11:51 PM   #10
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Drives: 135i Silber mit/Rot 6MT N54
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Originally Posted by lakylester View Post
Anyone else have any related experience?
Do you have your JB set to "auto clear". You might be throwing codes and the JB is clearing them before your ECL comes on.

The most common problem when installing downpipes is the tech/mechanic installs the O2 sensors backwards. There are pre cat and post cat O2 sensors.
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