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Old Apr 9, 2002 | 07:07 PM
  #1  
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IanW
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I am assuming that it is on an MY01 which has the ODBII installed.

Every Subaru manufactured after 2000 has On Board Diagnostics (OBDII), which monitor the efficiency of the original catalysts. If the downpipe and/or the up pipe are replaced with de-cat versions, OBDII will trigger an error code. The error code is P0420 “Catalyst below efficiency threshold”. This will also illuminate the Check Engine Light on the dashboard.
Quote taken from the Scoobysport website.

[Edited by IanW - 9/4/2002 7:07:37 PM]
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Old Sep 4, 2002 | 06:28 PM
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From: WMI
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I have recently removed the cat on the downpipe with a scoobysport downpipe, and i knew that the engine light would come on, and it has, but i've heard that when it comes on it restricts the power, is this true?? any help will be appreciated!!

ScoobyDoo69
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Old Sep 4, 2002 | 06:34 PM
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I dont think it restricts the power, you just have the CEL light on.
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Old Sep 4, 2002 | 07:04 PM
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From: Scotland
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Why has the engine light come on?

Mine didn't when I had my SS downpipe fitted...
It did come on however when my Lambda sensor packed up.

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