My x-reg ford mondeo has just failed its MOT on its emission test. The test shows that the carbon monoxide is too high 0.77% fast idle test, 0.60% second fast idle test. The HC is within limits as is the lamda. The garage says that it needs a new cat sensor and probably a new cat. There is a lound thump at the back every time I drive over a bump. The garage thinks this is a broken cat making the noise. Does this look like good advice? Should I get them to check the subframe bushes? Is there anything else that I can do to bring down the carbon monoxide reading? It has new oil, filters and sparks.
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Remove the first oxygen sensor when engine is cold and spray 1/3 of HEAVY DUTY DEGREASER block the hole and start for 10 seconds Repeat that 3 or 4 times to clean the catalyst converter ,clean the EGR valve for mail function .check your air filter .
Hi there, The most common concensus with white smoke is coolant leaking into some where in the combustion chamber as in head gasket, however you have said its not. turbos unless there is massive internal damage usually blow out black/grey sooty smoke. Is there bearing noise in the turbo at all? or Loss of boost? If so it could be early indication of the turbo failing. I would reccomend goign to a mechanic and having a leak down test perfomormed. Sometimes called a compression test. Or you could buy a decent compression tester and check it yourself. IT coudl also mean tha tna oil seal is blown or leaking Check your coolant resivour to see if there is any oil in there and check you oil dipstick to see if it is milky or off colour. Generally if there is either of these two it means that there is some \sort of leak between the two systems Oil and coolant. Anotehr common problem with these engines is a crack or warped head itself. However if your sure its not either of the above it could possibly be water getting into the combustion chamber via the injectors as in dirty fuel, however you would notice knocking and predetonation/ pinging surely. and generally the car woudl be running really rough. Make sure you keep a good eye on the coolant level as if it runs out it will surely kill your turbo friend. Hope this helps you out there, Cheers STeve
hi there, you will need a diagnostic check carried out to locate the exact fault, most garages have the equipment to carry out these checks so you won't need to visit your ford agent, a common fault on the engines is the camshaft sensor these cost around £20 and are very easy to replace, however once you have it tested you will now your exact fault, hope this helps