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2000 Volkswagen Beetle high Nox emission failure

Tiny
THETODD
  • MEMBER
  • 2000 VOLKSWAGEN BEETLE
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 50,000 MILES
Emission test showed Nox of 1028, limit is 485
CO% is 0.
HC is 7.
Mass airflow sensor and coolant temperature sensor replaced by dealer two days earlier. MIL light no longer lit.
Informed this vehicle has no EGR on a 2 litre gas engine.
Is the converter at fault with CO and HC so low?
If not, what else should be looked at?
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Tuesday, September 14th, 2010 AT 3:41 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be the catalytic converter or a computerized control system stuck in the open loop mode
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Tuesday, September 14th, 2010 AT 4:03 PM
Tiny
THETODD
  • MEMBER
  • 2 POSTS
Converter was found to be holed. Had to be small as little difference in noise was detected. However, was the culprit for sure. High Nox now very low Nox.
Thanks for the quick reply.
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Friday, September 17th, 2010 AT 11:11 PM

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