2004 Ford Fiesta - Engine management light on

Fiesta 1.4 zetec petrol Problem
The Problem
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buzby
Fixes: 2
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Engine management light on
Jan 5, 2012 (8 years ago)
engine management light is on.diagnosis reads catalyst efficiency below threshold[bank 1]P0420.any ideas

Car: Ford Fiesta
Variant: 1.4 zetec petrol
Year: 2004
Category: Electrics, ECU, Warnings & Lights
Recalls: Ford Fiesta Recalls
More: Ford Fiesta Problems
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autoinsider
Fixes: 68
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Jan 6, 2012 (8 years ago)
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.


Source: http://www.obd-codes.com/p0420
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buzby
Fixes: 2
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Jan 7, 2012 (8 years ago)
so p0420 could be cat replaced or just a sensor or both?
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rizzo
Fixes: 384
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Jan 7, 2012 (8 years ago)
it could be the cat or it could be a lambda ideally you need to get the live data read via computor to see what the engine is doing
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buzby
Fixes: 2
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Jan 9, 2012 (8 years ago)
how much about would fords charge for this
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