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Emissions Warning Light

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Old Dec 29th, 2006, 00:04   #1
Thierry14
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Unhappy Emissions Warning Light

Has anyone had issues with repeated Emissions warning light on V50s ?
I have a 2005 V50 2.4 which is now suffering repeated Emissions warnings.
Due to a severed radiator pipe and subsequent immediate loss of water, a warped cyclinder head was diagnosed by the Main Dealer several weeks ago and which was then replaced by said Dealer, however since then I have experienced the emissions light on several occasions. The first time of which was before I even got it off the forecourt following the cylinder head replacement. The Dealer the had the car several days and I believe "cured" the issue with new software, however two weeks on and the warning light has reappeared.
I am now waiting for garage to reopen on 02/01 to get it investigated further but wonder if anyone else is experiencing issues.
Engine seems to run fine and there does not appear to be any further loss of water, however I am wary to run the car should there be a major issue.
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Old Dec 29th, 2006, 12:11   #2
Engie
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Looks like the dealer has done exactly what he said he would do, ie replace the head and head gasket only, which is what any good dealer should do just in case no other damage has been done. Unfortunately when something like this happens there can be spin off damage. When the head/head gasket was gone you may have been getting oil into the combustion chamber and into the exhaust which as either neat oil or burnt oil as in a 2-stroke will line the exhaust including the catalyst in the catalytic converter rendering it inoperative or at least down in performance. The catalyst relies on surface area being in contact with exhaust gasses and if it gets coated like in a 2-stroke exhaust, then it cannot be in contact with the exhaust gasses due to a coating of a thin film of carbon.

Catalytic converters are expensive and the dealer did right not to warn you of the possibility because it you may have got away with it. I don't know if the cat-conv can be saved.

Last edited by Engie; Dec 29th, 2006 at 12:14.
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Old Dec 29th, 2006, 12:53   #3
Engie
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Just an after thought, because you said,
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and I believe "cured" the issue with new software
You may be lucky and it may just be running rich !

Suppose I shouldn't try and diagnose faults without 'proddin around'. Let the dealer diagnose the fault, these are just some possibiliities.

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Old Dec 29th, 2006, 13:05   #4
Engie
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Another thought, don't worry I will go away in a minute.

There is probably a 'Lambda sensor' (or oxygen sensor) in the exhaust which feeds back a signal to the Engine Management System. ie closed loop setting of the fuel/air mix and if this were to get a coat of carbon the wrong signal would be sent back to the management system, ie it may be telling the management system that it is running too weak so the management system richens up the mixture.

It could even be the sensor for emissions, anyway I would look in the area of the exhaust.
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Old Aug 3rd, 2007, 22:18   #5
Thierry14
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Just to close this one down, is reappeared a number of times, until finally the dealer diagnosed a fault with what he called the coil pack. Whatever it was that was changed it seems to have worked as it has now been six months without further emissions issues
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