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Hey guys, I've had a CEL since my GReddy install. I figured it was because of no cat. converter/no defouler. I recently installed a Strup angled defouler and the code has come back again. Any ideas of what to try next?
 

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I have the same code, it comes and goes. I have a straight defouler.

P0139 Secondary Heated Oxygen Sensor (Secondary HO2S) Slow Response
 
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