Factors That Degrade Emissions Driveability

The following major factors contribute to the overall increase in exhaust emissions levels and degraded vehicle driveability:

• Lack of scheduled maintenance

- Sub-system failures

- Combination of multiple marginal sub-systems

- Removal of emissions sub-system equipment

- Modification of engine/emissions sub-systems

• Use of leaded fuels or incompatible additives in closed loop control systems

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