[este]

Recently started getting a o2 sensor code even after deleting with BM3. Looks like damaged secondary o2 sensor. How critical is it to having this specific sensor online if I'm on ctlass dp's?

Cars runs fine now, I can always suppress code with bm3 tool.

CODE: "12B404 oxygen sensor heating after catalytic converter 2, activation: Line disconnection"

[123Britt]

My understanding is that the Rear sensor is not necessary but the rear sensor helps calibrate the Front Sensor and without it (Rear O2) the Front Sensor could start making incorrect readings over time.

I would and plan to replace my front O2 Sensor at 100k-125K and forget it.

[este]

Originally Posted by 123Britt

My understanding is that the Rear sensor is not necessary but the rear sensor helps calibrate the Front Sensor and without it (Rear O2) the Front Sensor could start making incorrect readings over time.

I would and plan to replace my front O2 Sensor at 100k-125K and forget it.

Ok I see, so it might occur over time just because of the primary one also deteriorating? or maybe ill replace both at 100k.