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  1. #1

    [OP] Senior Member

    Join Date
    Jul 2015
    Signal Hill, California USA

    Default PROMO - smart 451 aFe Air Filters

    Do you need a new air filter for your smart 451? This is the perfect time to replace the factory filter with a new reusable aFe Pro Dry S or Pro 5R intake filter. We are having our Memorial Sale which means you can get either of these filters at 40% off!

    Use promo code AFE400FF at check out.

    ProDry S (Dry Media)
    smart fortwo 451 Air Filter - aFe Pro Dry S (Dry Media) Online Store - smart car Parts and Accessories

    Pro 5R (Pre Oiled)
    smart fortwo 451 Air Filter - aFe Pro 5R (pre-oiled) Online Store - smart car Parts and Accessories

    This is just some of the items we have on sale. For more information and discounts check out our sale page here;

  2. #2


    Join Date
    Dec 1969
    I would recommend all 451 owners to replace with an air filter be it above or ebay vendor at least every two years.

    Reason, all diesel engines come with a supercharger (Cdi) and most petrol versions with a Turbo (petrol), and the last thing you want to do is starve the engine of air., if you have a very dirty air filter.

    My own Cdi at the time had a engine management light come up and car went into limp mode (gets you home slowly, with lack of acceleration, cannot get up hills easily, i,e hellish stupid limp mode), and I checked the code with a OBD code reader (10 or $15 on Ebay) and it read P0299,

    The P0299 DTC code refers to a condition where the PCM/ECM (powertrain/engine control module) has detected that the bank "A" or single turbocharger or supercharger is not providing a normal amount of boost (pressure).

    So the first and cheapest solution is replace air filter, and so I reset the code using the OBD code reader, and replaced with new air filter, and all was fine, as filter was very dirty and partially blocked

    Other but more expensive faults could be cracked air hose, faulty supercharger or turbo, but replacing the blocked dirty air filter is the first thing on the list.

    So the moral is change that air filter more often, if you want to avoid triggering the engine management light and end up in limp mode
    Last edited by Col Bolla; 05-31-2018 at 01:50 PM.

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