paceo

iTrader: (5)

can you elp me with these 2 codes, it was taken from a ford focus 2001 1.6 zetec which is my mates car. this was retrieved from a bluefin device.

i take it the first code it needs a new catalic convertor or lambda sensor but what is the one below?

po420 - Catalyst Sys Efficiency Below Threshold (bank1)
po723 - Output Speed Sens Intermittent

paceo

iTrader: (5)

will ford use these codes or does there machine read other codes?

paceo

iTrader: (5)

up

RichieST

iTrader: (2)

that will probably be the VSS speed sensor in the gearbox, always fail on focuses! But that fault will not cause the management light to come on. Get the o2 sensor replaced first, and disconnect the battery for half an hour or so to clear the fault code from the ecu.

Does the speedometer occasionally drop to zero when driving??

phil_focus

P0420 - Catalyst System Efficiency Below Threshold (Bank 1) Indicates Bank 1 catalyst system efficiency is below the acceptable threshold Use of leaded fuel
Damaged HO2S
Malfunctioning ECT
High fuel pressure
Damaged exhaust manifold
Damaged catalytic converter
Oil contamination
Cylinder misfiring
Downstream HO2S wires improperly connected
Damaged exhaust system pipe
Damaged muffler/tailpipe assembly
Retarded spark timing
Compare HO2S upstream and downstream switch rate and amplitude. Under normal closed loop fuel conditions, high efficiency catalysts have oxygen storage which makes the switching frequency of the downstream HO2S very slow and reduces the amplitude of those switches as compared to the upstream HO2S. As catalyst efficiency deteriorates, its ability to store oxygen declines and the downstream HO2S signal begins to switch more rapidly with increase amplitude, approaching the switching rate and amplitude of the upstream HO2S. Once beyond an acceptable limit the DTC is set.

P0723 - Output Shaft Speed sensor circuit intermittent failure The output shaft speed sensor signal to the PCM is irregular or interrupted. Harness connector not properly seated
Harness intermittently shorted, or open
Harness connector damaged
OSS sensor damaged, or not installed properly
Verify harness and connector integrity
Verify OSS sensor proper installation

pinched them from this thread on focus fanatics: http://www.focusfanatics.com/forum/s...threadid=59286

phil_focus

my speedo has dropped to zero once. 85mph along the m6 turned into 0

RichieST

iTrader: (2)

yeah, i have never heard of an early focus that hasn't had this fault!! replacement of the VSS is an absolute bitch aswell apparantely! Mine used to do it every now and then, for almost 2 years

phil_focus

i dopnt mind so long as its not doing it all the time and sorts itself out pretty quick!

took about 20 secs to sort itself out last time. mines a 2000 W reg aswell so defo an early one although has run reliably for 7 years and 100k and could easily do another 100k but would need a few bits by then

RichieST

iTrader: (2)

mine got to 170k before i sold it, i did have a new engine in it by then.

but by that time, the central locking was fooked, the roof and bootlid was rusty, as i said the speedo only worked occasionally etc etc etc....

Was a nightmare tho, the central locking kept unlocking itself all the time, i'd have it parked in the middle of town most of the day, come back to it and it'd all be unlocked

paceo

iTrader: (5)

so basically needs a new CAT?

where is this output speed sensor located? pictures?

phil_focus

if you look there is a whole list of things it could be but prob it lambda sensor or cat.

fuck knows where the speed sensor is

RichieST

iTrader: (2)

the speed sensor is in the gearbox, its what drives the speedo. take off the nearside wheel and arch liner for best access

But it is a CUNT to get out, best to chuck boiling water over it first. good luck getting the pin out in one piece If i was you, leave it be

paceo

iTrader: (5)

just spoke to ford and they said it rustS inside and in the worst case the gearbox will need to come off.

and they said the most common problem is that it will need a new CAT!

paceo

iTrader: (5)

with regards to po420, what is

Damaged HO2S

malfunctioning ECT

RichieST

iTrader: (2)

Quite possibly. Just leave it alone mate, get the cat problem sorted first. As i said, my VSS was playing up for almost 2 years, i just left it as i couldn't be bothered with the hassle of changing it. The car suffers no ill affects apart from the speedo cutting out for a few seconds!