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everything that makes the engine run, basically...read up on troubleshooting everyone should have a manual for their vechicle, and the library should have a professional shop manual available in the reference section for FREE to make copies of--the PRO manual has more detailed info, and may have wiring diagrams when needed...read up and fix 'em like a PRO...good luck Dave :) The main component of the emissions system is the ECU, (Computer). It is the brains of the system. There are numerous sensors that feed data to the ECU, telling it all sorts of things that help it to make the engine run as efficently as possible. Use Google and search with the term, "emissions controls 101",

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18y ago

What else can I help you with?