- J-Reezy wrote:
- Thanks. That's odd. The reason I asked was because I just installed a Tsudo N1 exhaust and instead of a cat it said it was an 18 in resonator. Then after a couple of days my CEL came on. So is that why my CEL came on?
The 2nd O2 is before the primary catalytic converter anyway.
Your CEL probably came on because your flow pattern which the ECU had learned shifted. Air was flowing at a faster rate over the 2nd sensor and it was likely reading carbon rich. Reset your ECU, and idle for 10 minutes, then drive it easy for 10 minutes. This should take care of that.