EGR, relation to lean? Options

[6gcnoob]

guys i keep failing the emissions test. im good on everything but my NOx. Ive been told time and time again that its my EGR or cat.

i am running two cats one on the stock mani and one new one down below. i got fed emissions.

i am also throwning a CEL # 25, lean air/fuel ratio. does the EGR have any relation to this code. if my VSV or temp sensor for the EGR failed wouldnt i be throwing a code for the EGR. i applied vacuum to the valve itself and the engine stumbled and died like it should. i cleaned the injectors and filter too but im still getting the code and failing.

[6GenCelicaST]

There is no sure fire way to check with out a timing light. But hooking one up is a piece of cake. There should be three wires coming off the timing light. the red and black go to the battery, for positive and negative. And then there will be a wire with the shape of an o on it. Open it up and put it around #1 spark plug wire. then aim away.