Question about 1998 Volkswagen Jetta

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P103 code in a 98 VW Jetta, 2.0 liter

My son has 98 automatic 98 VW Jetta, 2.0 Liter engine which is now throwing a P103 code. We have just replaced the Mass Flow Sensor, cleaned the fuel injectors. Only hose leak is the hose from the brake booster to the intake manifold but don't know if this is causing the code. Intake manifold was also changed. Hope you can help.

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  • pdaoodi Aug 30, 2008

    After replacing this vacuum hose with check valve, its still giving us numerous codes: P0103, P1127 and P1426. I don't know what to do except to replace the O2 sensor. Got any suggestions. Thanks.

  • Anonymous Mar 18, 2014

    i repaired canister leak and blockage at the vacuum source now p171 is on I can hear vacuum leak near intake and booster source hose (area)

  • Anonymous Mar 31, 2014

    i have replaced the fuel injector harness and the injector. i used a node lite an it flashes like is saYS IT'S SUPPOSE TO. but still getting the p0205 code. could also use a pictue of what the injector positions are. i noticed the is a cross-flow manifold.

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THAT LEAK IS UN-METERED AIR ENTERING THE ENGINE, FIX IT AND RETEST SYSTEM. P103 IS A MAF CODE. A MAF MEASURES THE AIR ENTERING THE ENGINE, AND BASED THAT AND ON OTHER DATA THE PCM DECIDES THE AMOUNT OF FUEL TO INJECT.

Posted on Aug 29, 2008

  • yadayada
    yadayada Aug 30, 2008

    All the notes I have read about the trouble shooting of these codes indicate a vacuum leak, take a can of carb spray and spray it around the intake, listen for an increase in RPM indicating a vacuum leak, poss intake etc..

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