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2000 Volkswagen EuroVan Question: p0300

 

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Visitor, 2.8L V6, Ogden, UT, May 15, 2010, 10:12

I have a 2000 Eurovan with a V6 OBD2 scan code of p0300 (random misfire). Also, a " Fuel System 1 , Closed Loop-fault". What does this mean? Thanks.

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  • Answer #1

    Bret Bodas from RepairPal Test Shop, May 15, 2010, 11:37
     Master

    Look here for a ton of great info on the p0300 code: http://repairpal.com/obd-ii-code-p0300

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    Visitor, June 02, 2010, 06:43

    Thanks for the information.
    It is helpful and I will follow up on it. I did not find anything about the " Fuel System 1 , Closed Loop-fault" though. Does anyone know what this means? Is it the Fuel pump, filter, regulator, lines, and return lines only? What is the "closed loop"? Thanks.

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    Bret Bodas, June 02, 2010, 16:38
     Master

    "Closed Loop" is referring to when the system is warmed up and using the oxygen sensor signals to make small adjustments to the fuel mixture.
    Open Loop" is when the engine is cold and it operates on a pre-set fuel mixture, as the engine and oxygen sensors heat up they can use this feedback loop, or closed loop to constantly monitor the fuel mixture settings and make adjustments.
    I haven't seen this specific fault before, what is the code that goes with that description?

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