Re: Fiesta 1.4 02 P0420 Catalyst System Efficiency Below Threshold
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Hi Dave your co readings are far to high.I would think the cat is being choked by is excess co and therefore is unable to store o2 which is why the rear sensor is switching in unison with front one .As said before i would check the air flow & vacuum readings.
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Message Thread | This response ↓
 Ford Fiesta 1.4 2002 - P0420 Catalyst System Efficiency Below Threshold # - Dave Hill March 26, 2007, 11:15 pm
- Re: Fiesta 1.4 02 P0420 Catalyst System Efficiency Below Threshold - george brockis March 28, 2007, 8:58 pm
- Re: Fiesta 1.4 02 P0420 Catalyst System Efficiency Below Threshold - Dave F March 29, 2007, 8:15 am
- Re: Fiesta 1.4 02 P0420 Catalyst System Efficiency Below Threshold - Peter Warman March 29, 2007, 9:35 am
- Re: Fiesta 1.4 02 P0420 Catalyst System Efficiency Below Threshold - Phil Dunmore March 29, 2007, 8:59 pm
- Pre & Post cat sensors at various engine speeds (Animated) - Dave Hill May 28, 2007, 5:22 pm
- Re: Ford Fiesta 1.4 2002 - P0420 Catalyst System Efficiency Below Threshold # - Dick Saunders March 18, 2009, 8:56 am
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on March 30, 2007, 9:50 pm, in reply to "Re: Fiesta 1.4 02 P0420 Catalyst System Efficiency Below Threshold"