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Thread: Oil light keeps coming on and off randomly...

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  1. #1
    Join Date
    Oct 2010
    Location
    Belfast, NI
    Posts
    1

    Red face Oil light keeps coming on and off randomly...

    Hello!

    I hope everyone is well. It's been a long time since I've logged in or owned a Smart, but I'm back, and have a wee problem - well I hope it's a wee problem.

    Last month I bought a 2012 SMART FORTWO 1.0 Pulse MHD 2d 71 BHP and last week the red oil can light has been coming on randomly and at times flashing.

    The place I bought it from checked the oil level, coolant level, pressure tested it, and reported back that everything looks ok and there are no leaks or concerns.

    Is there something else I should be getting checked just in case? I don't want to cause any damage to the engine and of course I want to be driving safely.

    Thanks in advance for any suggestions/advice/help.

  2. #2
    Join Date
    Feb 2011
    Location
    Lewes
    Posts
    742
    Well just checking that there is oil in it is the first step (just because it is easy to do). What you need to know is how much oil is it using per mile - That can only be found out by making a note of how much oil is in it currently, then driving something like a 100 miles and seeing how much oil you have to put in to bring it back up to the level you started at. Not something a garage is going to do unless you specifically ask them to do that.
    Reasons why the oil light might be coming on.

    Faulty oil sensor - cheapest reason
    Worn main bearings or Big ends in the engine - expensive reason
    Going to assume there are no oil leaks or the garage would have said so.

    Others might give you a longer list but those should give you some sleep less nights so I won't add any more.

    John

  3. #3
    Join Date
    Nov 2007
    Location
    BANCHORY
    Posts
    3,408
    Could also be the cable to oil pressure sensor that is touching ground causing oil warning light to turn on.
    Drives a Smart Cdi - 65 to 85 MPG

  4. #4
    Join Date
    Oct 2010
    Location
    Belfast, NI
    Posts
    1
    Thanks very much guys. I'm hoping that it's an inexpensive option. The place I bought it from have asked that I leave it in again as they think maybe it's a sensor issue and they're willing to fix it. I just hope that's all it is. I'll report back once I get a chance to drop it back to them and get it back.

  5. #5
    Join Date
    Oct 2009
    Location
    Bury Lancs
    Posts
    166
    when my Roadster started to do the same I replaced the oil pressure sensor - it's cheap & easy to fit - no difference.
    Removed the sump pan & found a load of instant gasket clogging up the oil suction strainer, removed it & cleaned it up & refitted - no difference.
    Turned out to be, as Heinkeljb suggested above main bearings. As it was the cam chain, cam sprocket & crank sprocket were all goosed too.
    s later .... it was sorted.

  6. #6
    Join Date
    Oct 2010
    Location
    Belfast, NI
    Posts
    1
    Ah crap! I'm really hoping not but thank you for the heads up. Now praying to the Smart gods that it's just a temperamental sensor
    Last edited by gurlsm@rter; 04-02-2021 at 09:40 PM.

  7. #7
    Join Date
    Nov 2007
    Location
    BANCHORY
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    3,408
    Quote Originally Posted by gurlsm@rter View Post
    The place I bought it from checked the oil level, coolant level, pressure tested it, and reported back that everything looks ok and there are no leaks or concerns.
    The easy way to diagnose your flickering oil warning light is to connect a pressure gauge and read oil pressure.

    Normal oil pressure on any engine at operating temperature is typically above 3 bar. Oil pressure switch on a Smart 451 with 1.0 litre engine will illuminate oil pressure warning lamp when pressure drops down to 0.2 bar and lower.

    If your garage is competent and worth their salt, they should aleady have checked oil pressure.

    Request you money back if they cannot sort this out.

    One thing is for sure, although responsible for most of our sufferings these dark days, Brexit and Boris cannot be blaimed for this.
    Drives a Smart Cdi - 65 to 85 MPG

  8. #8
    Join Date
    Nov 2004
    Location
    North Weald, Essex
    Posts
    181
    When did it have an oil change? Maybe a clogged oil filter might cause this. Simple & fairly cheap job to do. Just a thought.

  9. #9
    Join Date
    Nov 2007
    Location
    BANCHORY
    Posts
    3,408
    Read about oil pressure on Wikipedia.
    Scroll down a wee bit and study the four reasons for low oil pressure.
    https://en.wikipedia.org/wiki/Oil_pu...ustion_engine)
    Drives a Smart Cdi - 65 to 85 MPG

  10. #10
    Join Date
    Oct 2010
    Location
    Belfast, NI
    Posts
    1
    Quote Originally Posted by tolsen View Post
    Read about oil pressure on Wikipedia.
    Scroll down a wee bit and study the four reasons for low oil pressure.
    https://en.wikipedia.org/wiki/Oil_pu...ustion_engine)
    Brilliant! That's a great explanation on the possible issues. Thank you.

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