I have a Magnaflow Cat and I believe this is what is throwing the code. I have the AEM, but need to pass emissions here in GA. I installed the greddy blue box back in until I pass, but then the CEL came on. Would the aftermarket Cat throw this. I'm going to check to see if the sensor is plugged in correctly once I can raise the car. Just wondering if anyone else has had this experience?

 

if it is a code 65 thats the heater circuit and you will probably need a new secondary o2 sensor.

 

That's right. I'll check to see if the circuit is getting the right amount of Ohms and stuff first. Replacing the sensor is going to be a lot cheaper than buying a stock cat.

 

Anyone with a Helms, mine hasn't come in yet, can you tell me what specs I'm looking for on the Secondary O2 heater circuit? I have the multi meter to read ohms and voltage, but I don't know which wires to test or the specs for those wires. Any help would be greatly appreciated. THANKS!

 

terminal 3 and 4 should have 10-40 ohms.