I've got an LSU4.2 lambda sensor (wideband) here that is covered in carbon deposits. It's visible on the outside, so it's probably also present on the inside. The holes aren't blocked yet though, but the reading i get seems to be a little off sometimes, and it reponds slow to transients. I use the Innovate LM-2 to read the sensor. I did free air calibrate it recently.
Now I was wondering what is the best but responsible method to clean it?
A vast range of solvents is adviced on the internet; vinegar, coca cola, carburetor cleaner, WD-40, gasoline, or special 'carbon cleaner' solvents. Others say to just give it a job with the wire brush. Some say the only way is to set your engine lean, and burn away the deposits by making a sportive trip.
As far as i know the inside of the sensor, the ZrO2 and the pump membrane are fragile and easily contaminated. I wouldn't want to go and break it by using a agressive solvent or other unresponsible cleaning method. Soo.. Anyone who knows a good and responsible way to clean it? If you know one, i'd like to ask you to explain why it wouldn't damage the sensor.
Cheers (as far as i could find, there's no duplicate but feel free to point me to it :)