Hey~ After I change my cat to a test pipe, My ATTS light cames ON. Does it means I lose my ATTS or???? If I do How can I have it back...?? If it is possiable.
>"<~please help me with this and forgive me with my poor English..

A little Guy from Taiwan

 

If the ATTS loght is on the ATTS is not working. Check the CEL codes. You may have to implement the OBDII workarround to fix the CEL problem. Its the only way to keep the ECU from freaking out when it thinks the cat is not working/missing.

 

Thx~~very much
I will try to play around with it....

 

If you're using a test pipe you're getting a CEL light as well. The CEL light will be for either your secondard O2 sensor failure or catalyctic converter failure. You can throw a 10 ohm resistor on the o2 connection and solve the problem.

 

thank you!!! You are my Hero!!