Adoniram Posted May 6, 2011 Share Posted May 6, 2011 From MSNBC's thoroughly researched and well written piece, "Why your 'check engine' light might be on." http://www.msnbc.msn.com/id/42902305/ns/business-autos/ 1. Faulty oxygen sensor The sensor measures the amount of unburned oxygen in the exhaust and tells the car's computer how much fuel is in the tank. If a faulty one is not repaired, the car's gas mileage could drop, since the sensor is sending incorrect information to the car. It costs less than $200 to repair. (Underlining added by me) You'll have to read the rest yourself, but it's great. The cost for parts to replace spark plugs is over $200, btw... Or didn't you know? Link to comment Share on other sites More sharing options...
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