The cat efficiency code isn't being caused by the upstream sensor, but the downstream. The fact you've got a CVF catted DP is what's causing the rear O2 sensor to throw the code. Get a straight defouler and install it with the medium orifice, then thread the rear O2 sensor into it. That'll stop the P0420 code.
5 days ago · Used 2018 (18) Ford Focus 1.0 EcoBoost 140 ST-Line Navigation Ford Focus MK2.5 (2008-2012) Stereo Removal ST/RS - James Simpson Buying review Ford Focus II ST (2005–2011) Common Issues Engines
A bad fuel pump, ignition problems, clogged fuel filter, bad mass airflow sensor, and bad crank/camshaft sensors are just a few of the problems that can cause an engine to not start. 5. Poor Shifts. The transmission may have a hard time shifting, or not even be able to shift at all. Conclusion: Ford Focus Bad PCM Symptoms Shaking/vibration when accelerating. For a while now my ST shakes/vibrates when the turbo kicks in. I haven't noticed any loss of power just the shaking. The garage reckon the turbo needs replacing, quoted £1100! I find it hard to believe that a fault with the turbo would cause the car to shake without losing power.
My ST3 of less than 6 months old and less than 4000 miles (Ocean Blue not Performance Blue) has a problem. When I go to start the car after a period of rest, it will turn over for ages trying to kick in before it eventually starts up, however if I turn the key to start it, turn it off straight away, then back on again (if you know what I mean
Focus Titanium - ls rns sat nav mp3 radio navigation unit not working. it has twice powered off and powered on spontainiously without requiring the code to be entered to re-start. whilst powered off the new battery power was totally disapated. there was about 1 amp flowing. on removal of the unit the current flow ceased. the power comsumption of the unit has been checked whilst out of the car
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    • ford focus st mk2 common problems