[pbdr]

Hey,

My "check engine" light has been on for two months, EGR code of some sorts, and haven't made the time to dismantle and clean out.

A newish station now offers B20 fuel, so I wanted to try it. After 200km, the light no longer comes on? Is the bio-diesel doing this? Is it possible it has cleaned out a small portion so the code is no longer triggered?

I don't think so, but possible?

 

[chittychittybangbang]

Not possible. It might clean out something in the fuel system but if it's an EGR code then no way.

The CEL will go out by itself after a certain number of engine starts for a number for faults. This assumes that the fault doesn't come back.

This is probably what happened. Figure out how to fix the EGR code. These codes are normally related to a boost leak or vacuum line that has a break, or a sticking EGR.