2005 Mazda 6 exhaust emissions failed MOT.

2005 MAZDA 6
83,000 MILES
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HULLCITY
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Gas Values on emission test = CO 9.45........CO2 9.20........O2 0.08.........Lambda 0.744..............I have had 4 new plugs fitted, a new air filter, a new cat and Lambda censors checked - ok.........What can be wrong...........Could it be the Fuel injectors....Help.
Jun 26, 2013 at 1:37 PM
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DOCFIXIT
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Did you get a HC level?
Jun 26, 2013 at 1:38 PM
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HULLCITY
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Hello.......Yes........HC = 531
Jun 26, 2013 at 2:01 PM
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DOCFIXIT
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Bingo indicates Very Rich fuel mix so leaky injectors would be right
Jun 26, 2013 at 2:03 PM
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HULLCITY
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Hello........Not being a mechanic what work would have to be done to rectify this problem and is it costly.
Jun 26, 2013 at 3:04 PM
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DOCFIXIT
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First get a professional injector cleaning
Jun 27, 2013 at 10:08 AM