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Thread: A daft question about engine management lights and fault codes

  1. #1

    A daft question about engine management lights and fault codes

    About as off topic as they come, this...

    The engine management light on my xtrail came on the other day. I have been driving the car since and noticed no performance issues whatsoever, including a trip to the in laws where the engine would have had a good blast and any flat spots or underperforming would have been noticeable. I bit the bullet today and took it to a local garage for a diagnostic. The verdict was the EGR valve.
    Anyway, they've cancelled the fault code and the light has gone out. I know a very competent diesel specialist who works for beer money so the car will be going to him for any work.
    My daft question is this: How long does the cancellation last before the light comes back on, and if the light doesn't come back does that suggest some kind of glitch as the initial cause rather than a genuine parts fault?
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  2. #2
    Can you take the bulb out? If not just stick some insulating tape over it.

  3. #3
    If there's a Fault it'll come back on straight away

    if they diagnosed EGR fault can you buy a kit to remove the EGR valves and do away with them altogether ?

  4. #4
    Quote Originally Posted by Markfox View Post
    If there's a Fault it'll come back on straight away

    if they diagnosed EGR fault can you buy a kit to remove the EGR valves and do away with them altogether ?
    So no light, no fault? Interesting, I guess I'll have to wait and see if it comes back then...
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  5. #5
    get rid of the EGR
    its there for emissions nothing else
    It is also increasing the production of diesel particulate matter, one of if not THE leading cause of lung cancer

    if it is goosed the light will come back on when the emissions or fuelling registers as outside the normal range

  6. #6
    Conveniently I have a long drive tomorrow over a wide range of road conditions, so I'll see if it comes back or not.

    Is there a potential MOT issue with emissions if I remove/blank the valve, or is the effect not big enough?
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  7. #7
    What car is it, EGV are notorious on Vauxhalls and had one replaced under warranty on my first Zaffy. Often intemittent problem but can actually expire. I would just keep an eye on it but check you have breakdown cover just in case.

    D

  8. #8
    buy an egr blanking kit and get it blanked off. They put all this cooling of exhaust gasses in with intercoolers etc then return the exhaust gases back to the blinking engine to remove the gnats fart of co2 this does while sacrificing performance and fuel economy!
    all youll notice is an improvement in performance, a mile or two better fuel consumption and no warning light...oh, and it should still fly through the MOT.

    in edit....I couldnt give a rats ass how much money these car manufacturers spend developing their engines
    Last edited by limulus; 11-02-2016 at 21:27.
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  9. #9
    The warning light comes on when a sensors says there's an issue it could be a fault or a faulty sensor or a bad connection. I'd wait and see what happens

  10. #10
    car wont pass an mot with the engine management light disconected

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