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Old 01-14-2013, 11:24 PM   #27
200two-zx3
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Quote:
Originally Posted by ah1f39 View Post
The second o2 is for emisions not performance. It measures the ammount of unburned hydrocarbons after the cat
You are 100% right except you left out that when the and down stream o2 sensor detects high emissions it leans out the fuel trim which will cause poor performance. Also whn the enginelight comes on due to o2 issues the computer turns to a preset loop.
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