I just had my CTSC tuned with greddy emanage blue and after a 100 miles the cel light turned on. I checked the code and it was the 2nd 02 sensor. is this normal? can it be fixed to stay off? i had it cleared but turned right back on. what causes this?

 

It usually comes on in the absence of a catalytic converter; are you running a test pipe?

 

Sensors do go bad.

I had a sensor go off on my last s2k (it was CT supercharged) because I reversed two small hoses. It would be fine for a couple of days and then kick the cell off, after I got the hoses where they belonged it fixed it.

Before you ask, the only thing I remember was that it was two small hoses near the crank case or head near the front of the engine.

 

ya its got a test pipe

 

test pipe will cause a CEL for secondary o2 sensor; try fitting 2 antifoulers on

you will probably have to drill one for the tip of the sensor to fit

 

Ya I already have one on there i will try using another