- Ford focus 2003 model 1.6 zetec Archived Message
Posted by Stuart Wilkinson
on October 12, 2007, 11:39 am
| P0420 - Catalyst System Efficiency Below Threshold (Bank 1)had this in today fuel pressure ok all gas settings ok just been in for mot no misfire runs ok cannot clear code keeps coming back cat working ok but a bit slow im wondering if excess fuel in exhaust from previous misfire when we fitted coil pack could have done some damage down the line somewhere |
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