2011 Xterra ECM question
I have a 2011 Xterra s. Bought brand new. 200k miles. Garage kept, beautiful overall. Recently received check engine light code 430. Downstream O2 sensor bad catalytic converter fault . took it to a guy in my town known for mufflers and catalytics. He said the catalytic is fine the muffler is fine 02 is fine. However the problem is that the ECM sending crazy signals. I need a new ECM he has seen it before. Nissan doesn't make the ECM anymore. There's a company online that sells aftermarket and a few people that sells them on programmed. My question is will the ECM solve it? He said if I didn't get the ECM that the catalytic would eventually burn up because it gets extremely hot with all the mixed signals. And do you trust buying one from these aftermarket places?