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        General >> Problems >> Mot fail
        
(Message started by: kittman on Jul 13^th, 2007, 6:32pm)

Title: Mot fail
Post by kittman on Jul 13^th, 2007, 6:32pm

My 95 cossie estate failed the mot on emissions(amongst other things), the guy recons it was o2 sensors on the exhaust . Is there any way I can find out which one is faulty and how much do they cost to replace. Had a scan done last week and it showed it was running rich on both sides P0171 P0174.

Title: Re: Mot fail
Post by dan_the_man on Jul 14^th, 2007, 12:52am

you can often fudge an emmissions test by removing the air filter . I understand this aint a long term solution.

Title: Re: Mot fail
Post by Highlander on Jul 14^th, 2007, 8:45am

Not heard of that one about the air filter, how does that work?
If you give the car a long hard run before the MOT to properly warm the cats up that can help

Title: Re: Mot fail
Post by kittman on Jul 14^th, 2007, 10:26am

I did about 30 miles of motorway before the mot so cats should have been warmed up nicely

Title: Re: Mot fail
Post by scorpio_man on Jul 14^th, 2007, 11:32am

hi there

have a read of .... http://www.fordscorpio.co.uk/fuelmonitor.htm

you can check the sensors out using a meter (not easy, but do-able), set to 1 volt. this is where VE software makes it a bit easier; you can 'see' what's going on.

i'd say it was more than just faulty lambda sensors; they'd should show up as codes. more like the fuel pressure regulator or cat(s). :-/

again, this is checkable with VE, if you can find a member nearby with a lead.

hth

Title: Re: Mot fail
Post by kittman on Jul 14^th, 2007, 11:54am

Thanks for that, I,ll try and arrange a scan by a member