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'97 aero cel /rear o2 sensor
Posted by John G. (more from John G.) on Wed, 26 Mar 2008 18:28:23
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I had a full 3" s.s. exhaust installed on my '97 aero and since then I have been getting cel's. I had the ecu upgraded to a stage 3 and have since put a stock ecu from a '97 aero back in. This did not fix the problem. Was getting cel's for both the front and rear o2 sensors, while the wiring in the connectors for the sensors were ok. No pushed-in pins on the ecu or wiring to ecu, and no apparent vacuum leaks. Installed new front and rear o2 sensors and getting a cel for the rear sensor, which is not showing a continuous reading at .5 volts, but instead shows a wave pattern between .2 and .9. Have been told that it is possibly a problem with the wiring, specifically with a ground. Any info as to where to start looking next would be greatly appreciated.
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