[mrchris1979]

I just did a DX to SI manifold swap and everything worked well except the O2 sensor went out and Code 1 on the ECU. I replaced the sensor and reset the ECU but a few days later, same problems. I'm thinking it could be the $45.00 O2 sensor from Checker so I am replacing with the OEM $200.00 in a few days. Before I do this, does anyone know if the problem could be somewhere else causing the code ?