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Volkswagen TSB #Campaign Circula
1999 Volkswagen Jetta
TSB Document:
Affected Component: ELECTRICAL SYSTEM:SOFTWARE
- Summary
- Emissions Service Action Circular (VR6 Engine Update ECM Software for Catalytic Converter Monitoring System): The ECM software for the catalytic converter monitoring system is too sensitive. This can cause the MIL to come on, and some vehicles may exceed Federal and/or California emissions standards. Also, in some cases this leads to unnecessary catalytic converter replacement. The corrective action taken for this issue was to Update ECM software.
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