Originally Posted by jeff

the 03 cat is not welded to the downpipe it is instead bolted.. and yes the o2 sensor is in the front part of the cat.. so then a code would not be pulled... correct?

Originally Posted by Blacksheepdj

The warm up cat is the one in the header.

Look, you aren't getting this. You have the front O2 sensor, then some catalytic material in the stock header (exhaust manifold), then the second O2 sensor. Those are the only things that factor into the equation.

The rear catalytic converter does not matter in terms of CEL.