Hi I just got an 02 WS6 on trade. It was supposed to be bone stock except for a flowmaster catback. I got under it this morning and saw it only has one catalytic converter but still has rear O2 sensors. I was wondering how it hadn't set a 420 code since it was missing a cat. So I graphed the sensors and the rears were switching. I thought maybe they were tuned out so I unplugged them to see. When I did they read around 450 and the car didnt set a code. I have driven the car now probably 100 miles with the rear O2s unplugged, and the car still hasnt set a code. Does this mean the rear sensors are tuned out? Is there any way to know for sure if it has or hasnt been tuned? Thanks in advance guys.

 

tuned and codes turned off are two different things....

lots of people have codes turned off for $50 from some local guy...

tuning means there have been changes to other things other than DTC codes..

only way to tell is to read the file and compare to a known stock one

 

Thanks alot man. That's what I was looking for. I'm assuming the codes have been turned off for the rear O2s. Im thinking I will get a mail order tune after I put some long tubes on.

 

You can mail me the pcm, just pay return shipping and I'll look at the tune and let you know if its stock or not.

 

Where are you located?

 

College Station TX

 

What part of KY are you from?

 

Around Bowling Green. You guys tuned a trans am that belongs to a friend of mine not too long ago. It was a black nitrous car. I have decided to get a mail order tune from you guys since your pretty close to me and I have heard nothing but good from you guys. I will be in touch soon.