Knock!!

Last Sunday when I was driving to my in-law's place with my wife and kid when my CEL came on. It's the usual P0139 (too lean). I was logging for knock at that time so I couldn't do a full analysis, but it was still useful though. Here's how it looks like when it happened:



You can see me coming off the throttle (0% in the last column) when I got the CEL.

One interesting thing I found out was that when I finally reached my in-law's place, I cleared the CEL code using my OBD2 reader (ScanGuage) and my drive on the way back home had knock all over. Strange .. I wun be reseting CEL using my OBD2 reader for now.