2004 Ford Fiesta 1.4 zetec petrol Engine management light on

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

Car details
Car: Ford Fiesta
Variant: 1.4 zetec petrol
Model Year: 2004
Category: Electrics, ECU, Warnings & Lights

Recalls: Ford Fiesta Recalls
More: Ford Fiesta Problems
Parts mentioned in this problem
Replies and fixes
Avatar
autoinsider
Fixes: 70
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
Avatar
buzby
Fixes: 2
Jan 7, 2012 (8 years ago)
so p0420 could be cat replaced or just a sensor or both?
Avatar
rizzo
Fixes: 384
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
Avatar
buzby
Fixes: 2
Jan 9, 2012 (8 years ago)
how much about would fords charge for this
Post a reply
Please login to reply
Planning on fixing the problem yourself?

If you need parts to do the job head over to Euro Car Parts to find the parts you need.

  • Free UK Delivery
  • 365 Day Returns
  • Free Click and Collect
Fix your Fiesta problem

Add your problem now, it's quick and easy

Post a Problem
More 2004 Fiesta problems
Problem Fiesta Model
Dashboard Light TransitConnect
Transmittion system
Hazard lights 1.4 silver
Fiesta Dash Fault 1.4 Zetec
NOT TURNING OVER. 1.3 LX PETROL
News & Updates
Need an MOT after lockdown?
Find your nearest MOT Test Centre

Volvo Seat Belt Recall
Affects S60CC, V60CC, S60, XC60, V60, XC70, V70 and S80

AutoInsider recall database updated
Recent recalls for Volvo, Audi and Porsche

Find your nearest
Diagnostics App

Identify problem parts

Try it now
On Social Media