Hey all, I've had the EGR light come on before and ended up getting a new O2 sensor and the problem went away with that code, but I was wondering if there are any other easier ways? I've heard of cleaning out the EGR valve but I have no idea what that is or where for that matter. I'm not sure what the 121 means but from what I've read it's:
1-2-1*
Faulty signal to/from Air Mass Meter
Wiring fault to or in AMM
NO idea what this part is but any help appreciated, thanks