Thread: HELP !!! St170 won't rev fast 4000k
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Old Mar 10, 2013 | 04:46 PM
  #19  
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oldford
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Oxygen sensor behind the cat is required by law (EOBD) since 2001.
Without the 2nd Oxygen sensor you would not get a fault code on the cat.
So, you should have this 2nd sensor.
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