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I removed my O2 sensors yesterday (the two before the cats) and they are very black, doesn't look like there is any way that they are getting any exhaust into them for a reading, yet I wasn't getting any codes. They were Bosche replacements. Jeff Kopp said he could get them to me for $35 each (minus shipping) but gmpartsdirect.com seems to have a better price on the sensors.
So anyone have the part numbers? They were both 4 wire... the driver's side one had all four wires go into the top of the sensor. The passenger side one had 4 wires, one of which was yellow and went into the side of the sensor while the other 3 went into the top.
This is the only # i've found so far.. 25312184 $32 at gmpartsdirect.com
Just ordered them (2 knock sensors, 2 O2 sensors, and an oil level sensor)from Jeff, the total came out even lower than GM part direct. Yes, the 18% shipping from GM partsdirect is RE-GOD-DAMN-DICULOUS!
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