So I've been working on the 240D and the Ford in between, but while waiting for parts, decided to drive the 300E again.
I stopped at the point of changing the O2 sensor, debating if I should just clean it or replace it - but now I have a new issue:
The check engine light is off, but the ABS light is ON!
Hard to start, idles very, very rough, sometimes almost dies or dies.
***Weird, before it was revving too high, now too low*****