okay. a few months back, i got EGR codes and 02 sensor codes. I solved the EGR code by cleaning the EGR passageways. The 02 sensor code was nothing to worry about, just slow response on bank 1, sensor one. well, the EGR code is back, along with the 02 sensor code.
P0133 02sensor slow reponse (Bnk 1 Sns1)
P0401 Insufficient EGR flow detected
will i need to clean out the passages again? im gonna check it out tonight hopefully, but probly wont be able to for awhile. My shop teacher said it might be the PCV valve, meanings how last time i cleaned it, the stuff clogging it up was gunky, almost as if it had oil in it. whats your thought on this.
and is the 02 sensor code due to clogged pre-cats? or is that something else.
thanks in advance
