My GS 911 shows a fault code of Lambada 368 it show 78 times in 2 days. What is this? O2? I t runs crapy and mpg is down to 26. Any help would be great. Jim
ps. 02 K1200LT 250 k miles
The term Lambda-sensor and Oxygen-sensor are used as meaning the same in various technical documentation.
In your case, code 386 is normally attached to a longer corresponding description that you should have seen in GS911 interface. In general, code 368 is: "Lambda-Control, Upper Adaptation limit reached".
For BOSCH-Motronic 2.4 we have in K1200LT, this means that the system is running too lean and the acceptable / limit programmed in EFI system to make it richer has been reached (this is adaptation / compensation). It is programmed within the EFI that a certain acceptable percentage of richer/leaner can be done from the base fuel map - beyond these limits, the system will raise a red flag (a fault).
Based on past experience with this error code, I doubt your O2 sensor is defective: in this case error 368 is the messenger, not the cause. If indeed the O2 sensor was defective (no signal), you would have read error code 304 instead. Even if the GS911 graph function of O2 sensor shows a lean condition, you need to keep in mind the job of this sensor is to report what it sees, nothing more. The troubleshooter needs to use all other available info. Please read this from GS911 web site: http://www.hexcode.co.za/techinfo/lambda
Of course, it is simpler / faster to just replace the O2 sensor and try a again for a few rides (after clearing the old faults using GS911). HOWEVER, based on my experience I would say there is a higher probability this error is caused by a low / weak fuel pressure. In the past we have seen this error when there is a split or damaged hose inside the fuel tank. This would happen either after a fuel-filter replacement (bad install) or because one of the 2 short rubber hose was very old and cracked (ethanol in modern fuel).
ALSO... note that a bad vacuum leak from intake system (multiple small vacuum hoses, rubber around throttle-bodies) would also cause the system to potentially generate the same fault: too lean and EFI tries to compensate richer.