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Your 2000 beetle has just failed its mot for emisions the garage computer says oxygen sensor 1 is faulty you have replaced this and it is still failing the test could the airmass unit be faulty or cat?
Wiki User
∙ 16y ago
I had this problem, went to 3 different shops, replaced 2 o2 sensors, a mass airflow and various other vac tubes, before discovering the terminal was snapped. Check the battery terminals and cables before proceding any further. It may save lots of money.
Wiki User
∙ 16y ago
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