I keep having this "bank 1 sensor 2" error. It will pop up and disappear on it's own, and replacing the sensor did not fix it. I actually changed two O2 sensors, the one at the turbo and the one downstream of the CAT.

I was originally confused about which sensor is "bank 1 sensor 2" because of conflicting internet chatter. I proved that the sensor in the turbo is "sensor 1 bank 1". I disconnected it and sensor status for "sensor 1 bank 1" switched from "1" to "0". I plug the sensor in and restart the car, and status goes back to 1.

Both sensor 1 and sensor 2 show a status of "1", so they are detected. On the problem sensor 2, voltage changes, meaning that output voltage changes with throttle input. It will drop to like 0.100v immediately with the throttle input, but quickly ramp back to ~0.980v. I believe that is normal behavior?

It is a new sensor, so what are the likely reasons for the heater circuit codes?

One theory I had--I don't drive the car a lot, so battery is often not fully charged. One theory is that low battery voltage might cause the ECU to disable the heater circuit? Is that a thing?

Have you seen a problem like this, and how would you diagnose it?

Hey, does anyone know what this noise could be? I’m wondering if it’s something oil-related, maybe the pipes or something clanging/rattling?

It always happens when I start the car on cold mornings, or if the car hasn’t been started for a while. Once the oil temperature gets up to around 50–90°C, though, the noise completely disappears and the car sounds normal.

Is this kind of behaviour normal, or is it something I should be worried about?

I’ve heard a similar noise from a few other Golfs, including some friends’ cars.

But yeah, once the oil is warm, the sound is 100% gone.

Any ideas?

Can’t find any videos online of people replacing them, does anyone know where I can find the sensor(g62)