Daz1981dp Posted October 5, 2012 Report Share Posted October 5, 2012 Hi AllMy Lupo Sport has been running fine after the throttle bodies were cealned new breather pipe new egr valve and new fuel sensor. recently its started to judder slightly at around 2000 revs.there is a fault code 16804 but this list loads of different things. has anyone else had a similar issue or any ideas where to start?once you go past 2000 revs is fine its just is you going along at constant 2000 revs you can feel the car juddering.ThanksDaz Quote Link to comment Share on other sites More sharing options...
davidelliott294 Posted October 5, 2012 Report Share Posted October 5, 2012 16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold Possible CausesLeakage in Intake and/or Exhaust SystemCatalyst faultyOxygen Sensor(s) faultyOxygen Sensor(s) Control faulty Possible SolutionsCheck Intake and Exhaust System for LeaksCheck CatalystCheck Oxygen Sensor(s)Check Oxygen Sensor(s) ControlPerform Oxygen Sensor(s) Aging Check Quote Link to comment Share on other sites More sharing options...
Daz1981dp Posted October 5, 2012 Author Report Share Posted October 5, 2012 yea i looked that up, but where to start, looks like its going to be a garage job. Quote Link to comment Share on other sites More sharing options...
davidelliott294 Posted October 5, 2012 Report Share Posted October 5, 2012 yea i looked that up, but where to start, looks like its going to be a garage job.Put your hand over the pipes on the exhaust. Rear of the car. If it doesn't blow your hand off or the car begins to struggle to keep running then you have a blow in the exhaust. That's all I can assist you with. Quote Link to comment Share on other sites More sharing options...
Daz1981dp Posted October 13, 2012 Author Report Share Posted October 13, 2012 would this hole cause the fault code / issueThanks Daz Quote Link to comment Share on other sites More sharing options...
davidelliott294 Posted October 13, 2012 Report Share Posted October 13, 2012 would this hole cause the fault code / issueThanks DazPossibly since that is the air intake pipe? Someone correct me if I'm wrong. Try taping it up. Quote Link to comment Share on other sites More sharing options...
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