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Old 04-29-2008, 09:27 AM   #16
blue2000s
Porscheectomy
 
Join Date: Mar 2006
Location: Seattle Area
Posts: 3,011
You WANT the forward O2 sensors in the exhaust stream. This makes corrections in mixture during closed-loop operation. Don't use a cheater on these, use a normal bung.

For the rear sensors, if you can't get a reflash, you can replace the sensor with a circuit that tricks the ECU into thinking all is well. I've posted it here before if you're interested you should be able to search for it.
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