ProtractedSilence -
I just enabled this for my previously non-heated narrow-band 02 sensor. Now I can *see* the 02 sensor in the exhaust manifold heat up using my digital AFR gauge :
Using heated 02 sensor in place of non-heated 02 sensor
My post-cat 02 sensor is already heated, so nothing to do there.
However, it doesn't appear that my ECU/PCM is taking advantage of the pre-heated 02 sensor, or at least I can't prove it. My reason for doing this mod was for emissions and *hopefully* quicker switching to closed-loop operation after EOC and engine-off at stoplights.
I think anyone can test your friend's advice if they have a
ScanGauge and all of their 02 sensors are wired for self-heating. The driver just has to compare how fast the car goes into closed-loop operation.
I agree it's a small benefit, but I like the idea of it nonetheless.
CarloSW2