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Mercedes-Benz S430 Airmatic Pump Motors May Fail Due to Sticking Relays

 
Mercedes-Benz S430 Problem
49 Reports
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Model Years Affected: 2000, 2001, 2002, 2003, 2004, 2005, 2006

Average Mileage: 105,796 mi (13,600 mi - 200,000 mi)

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The relay which turns the airmatic suspension pump on may fail causing the pump to run continuously. This can result in failure of the pump motor or a dead battery as the pump motor will continue to run after the car is turned off. Also, Worn airmatic pump mount bushings can causes noises in the front axle while driving on bumpy roads or a buzzing noise while the pump is running.

  •  Rookie

    The AirMatic Relay and 40amp fuse are within the fuse box under the hood on the passenger side. The AirMatic pump is inside the right front fender. Remove the rubber shield on the passenger side just behind the bumper. The AirMatic pump (about $350) can be seen. Very easy fix. R/R mounting bolts and buy a new 1/2 inch air inlet hose from AutoZone ($3.00). You can replace the pump in less than an hour.

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  • Visitor, , 131,000 mi

    Normal driving at 40MPH, came to a stop and felt a drop in the car, but no noise so continued to drive and the dash light came on with the message AIrmatic service get service.

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  • Visitor, , 136,000 mi

    On my car the pump continuously running, then a started the car again I heard a clunk and the pump stopped. I drove it several miles to my next destination when I started the car again it did not raise up the instrument panel stated to stop driving car is to low get service.

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  •  Rookie

    my car is sitting on my tires i was driving then the whole car just sat low on the tires i guess the airmatic pump gone or the relay how much will this cost me aprox.

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  •  Rookie

    occasional rumbling sound under the car just forward of the passenger side firewall right after startup and car completes rising at front end. Also hear a bumping sound like worn shock when going over speed bumps even at very slow speeds.

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  • Visitor, , 40,325 mi

    The car sits very low went to dealer cost fortune

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  • Visitor, , 124,600 mi

    Vibrating noise on front end that makes the drive very uncomfortable. It makes you hate such a lovely car.

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  •  Rookie

    The pump continued to run after car was shut off, causing the battery to run down. Using Alldata as a reference, I unplugged the air pump to keep from running the battery down. Relay N10/1KR controls the air pump. I have yet to find the location to that relay. Alldata does not give that information.

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  •  Rookie

    airmatic motor and sticks went out

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  •  Rookie

    During two years of ownership, the airmatic suspension on my s430 have frequently released air when first starting or cornering, it sounds similar to the sound of air releasing from the air brakes on a bus. The noise was easy to tolerate, so we always sloughed it off, and considered our car as kind of a 'gassy girl."

    Last night, after starting the car up, the noise became more pronounced, more gastrointestinal and guttural. After driving approximately 50 miles, there are no more sounds but the left side of the car is unusually low, so we are opting to have it repaired by our trusty Euro service team.

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