Hi, Today my 2004 Honda Accord 2.4 Type-S petrol failed it's MOT on Omissions with an O2 reading of 0.8. I was expecting this however as my CEL was on with 2 codes, po137 and po137 (pending). From this I expected a new O2 Sensor. My normal garage got a replacement (£106 +vat), retested it but the readings stayed pretty much the same and from this advised me that they believe I need a new cat. On coming away from the garage whilst they price me a replacement cat up, I checked the codes now and along with po137 and po137 (pendin) there was also po141. Now I have had the CEL on for a good 6 months and have never seen po141 until now. Does this sound more like a duff replacement? Or would you consider a replacement CAT? Help much appreciated!!