rear o2's
 

I had a mailorder tune on my ecm when i did my swap and had the rear o2's tunned out. I noticed with my predator that im showing reading for 4 sensors and i only have the front 2. Any ideas

Electrical noise?
Are they valid type readings or random values?
You need to realize, when the rear O2's are tuned out, the PCM still reads the pins, it just ignores setting the error codes, if it doesn't like the readings

Thank you, I cant remember the actual readings, I just thought it was strange too be reading something that wasn't there. We have about 4'' of snow right now so when everything clears up ill wright down the readings.

correct - what poconojoe said...

only the trouble codes for the rear O2's are disabled - so they don't throw codes and turn on your CEL... but they will still have readings if they're connected to the wiring harness...