Now's a good time to have the engine's codes to be read by an OBD-II Scanner. You can buy your own scanner for under $100 from Walmart or Sears that will tell you in English what system is failing on your vehicle.
Or, you could have Autozone or Advance Auto Parts scan it for free to determine which codes exist, and sometimes their meaning.
It could be as simple as a tune up or as complicated as the hundreds if not thousands of codes that exist on engines these days.
Good luck on scanning your computer.
The check engine light/service engine soon (yellow light) comes only when the computer control unit (called the PCM) senses a fault in the electronic controls of the engine and/or the emission system u will seldom feel the car engine run any different, there are about 200 possible faults that turn the light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.
SOURCE: SERVICE ENGINE LIGHT ON FAILED EMISSIONS
Yes, take it back. The might of replaced the Egr valve to turn off the light. Don't let them charge you for retesting it, that's why you took it in in the first place.
SOURCE: check engine light emission leak
youll have to take it a shop and have them fill the system with "smoke" and examine the entire system for the "smoke". the smoke will pour out from where ever it is leaking from
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