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Black smoke and starting difficulties with 2012 BMW 1 Series Diesel: Possible defect in the fuel filter heater?

Hi everyone, please help me out here. My 2012 BMW 1 series diesel with 77030 km on the clock is causing me a bit of concern. Black smoke comes out of the exhaust when accelerating, the check engine light is on, major problem with cold starts and it has happened to me a few times that the engine has stopped on its own. Sometimes it even won't start. After my last bad experience with the mechanic, I'm a bit cautious and think it might be a fault with the fuel filter heater. Have any of you had anything like this before? Would love to hear your experiences before I go back to the mechanic. Thanks in advance!

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26 comment(s)

Have been driving for approx. 2 years with a defective fuel filter heater according to Carly. I haven't done anything yet, because the car (330xd) runs without problems even at low temperatures.

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Can the faulty fuel filter heater be a cause of a drop in power or not? Or just for winter starting problems because I don't have any problems with starting and I don't smoke.

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Quotation:
@Borat wrote on
Can the faulty fuel filter heater be a cause of a drop in power or not? Or just for winter starting problems because I don't have any problems with starting and I don't smoke.

A faulty fuel filter heater is unlikely to cause a drop in power. It's primarily designed to prevent diesel fuel from gelling in cold temperatures, which can lead to starting issues. If you're experiencing a loss of power, it could be due to a variety of other issues such as a clogged air filter, fuel injector issues, or problems with the turbocharger. It's best to have your vehicle inspected by a professional to accurately diagnose the problem.

Hello, the problem persists, fuel filter heater, the car runs without problems, I have also replaced the diesel filter and heater, but Carly still shows the error?

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Quotation:
@Falke wrote on
Hello, the problem persists, fuel filter heater, the car runs without problems, I have also replaced the diesel filter and heater, but Carly still shows the error?

Hello, Have you also checked the cable connection to the control unit? If the error cannot be deleted, then the error is currently present.

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Ja,

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Turbo problem Lmm sensor defective exchanged and replaced Diesel filter heater defective

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Quotation:
@Mustafa wrote on
Turbo problem Lmm sensor defective exchanged and replaced Diesel filter heater defective

If you've replaced the LMM sensor and the diesel filter heater but are still experiencing issues, it could be a problem with the turbocharger itself. This could be due to a variety of issues such as a worn bearing, a damaged turbine, or a clogged wastegate. It's best to have your vehicle inspected by a professional to accurately diagnose the problem.

The fuel filter was replaced at ATU.

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Quotation:
@Tappsoli127 wrote on
The fuel filter was replaced at ATU.

If the fuel filter has been replaced and you're still experiencing issues, it might be worth checking the fuel pump and injectors for any faults. If these components are working fine, then the problem could lie elsewhere. It's always best to have a professional mechanic inspect your vehicle to accurately diagnose the problem. Do you have any further questions or is there anything else you're unsure about?

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