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S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004. |
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Engine Management Light illuminatedViews : 1056 Replies : 6Users Viewing This Thread : |
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Aug 30th, 2008, 17:06 | #1 |
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Last Online: Jan 18th, 2009 12:04
Join Date: Dec 2006
Location: Redditch
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Engine Management Light illuminated
My V40 diesel with 115k on the clock was running a bit rough last week and I thought it was probably the injectors needing a good clean out. I bought some Redex fuel system cleaner and put it in last weekend. I ran the car normally all week but it didn't seem to be clearing. So yesterday on my home from work on the dual carriageway I gave the engine a good hard run by revving it up to 4-4.5k revs in 2nd, 3rd and 4th before changing gear. I could see in my rear view mirror that I was leaving an enormous cloud of smoke trailing behind me and this did the trick as the engine is back to running smoothly. Ironically at this point the Engine Management System Malfunction warning light has come on. The manual says a fault has been detected in either the fuel or ignition system. This could mean that the engine does not meet exhaust regulations.
The car starts and runs ok and I cannot hear any unwanted noises from the engine bay so what could be the problem? Should I just persist with another dose of injector cleaner? Finally, when I resolve the problem how do I stop the warning light coming back on or will it reset automatically? |
Aug 31st, 2008, 18:54 | #2 |
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Last Online: Dec 29th, 2013 22:39
Join Date: Dec 2003
Location: Ashford
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It probably is to do with the emissions. You need to reset it wit an OBD2 scan tool(assuming the car is post 99 as they dont work with cars before that).
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Aug 31st, 2008, 19:22 | #3 |
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Last Online: Jan 18th, 2009 12:04
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Location: Redditch
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It is a 99 model - so I guess that won't work.
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Aug 31st, 2008, 19:29 | #4 |
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Last Online: Dec 29th, 2013 22:39
Join Date: Dec 2003
Location: Ashford
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It might do as 99 was the change over year. My Sept 99 car was OBD2 compliant.
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Sep 3rd, 2008, 09:42 | #5 |
VOC Member
Last Online: May 4th, 2011 11:56
Join Date: Dec 2004
Location: Mansfield
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OBDII will work on '99 cars. The engine management light will go off by itself in a set amount of engine hours, or miles, depending on how it's set up. This is assuming the problem which caused the light to come on in the first place was only temporary. It's always best to find out the fault code number so you know what the problem is. You could either fork out £40ish every time to get a dealer to diagnose it, or buy yourself an OBDII scanner. You can get them off ebay for about £25.
Paul |
Sep 4th, 2008, 22:29 | #6 |
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Last Online: Jan 18th, 2009 12:04
Join Date: Dec 2006
Location: Redditch
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Thanks Paul, is there a particular scanner you can recommend? Do they just give you the error codes or do they tell you the meaning of the error codes also?
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Sep 5th, 2008, 09:13 | #7 |
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Last Online: May 4th, 2011 11:56
Join Date: Dec 2004
Location: Mansfield
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Can't find the ebay link for the one I got, but it came with a manual which lists all the fault codes and their meanings. Just search ebay, I remember there were at least half a dozen different ones one there, all do exactly the same thing.
Paul |
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