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Toyota Repair/Corolla engine light on again

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Expert: Ted Ritter - 10/22/2009


Question
I own a 2000 Corolla with 85,000 miles.  In the last year it has started to burn oil, about 0.25 quarts every 500 miles.  In the last 6 months the engine light has gone on 3 times after highway trips, always showing a P0171 code.  I have cleaned the MAF sensor twice; the gasket on the MAF sensor is beginning to get loose.  I have also used fuel injector cleaner after these episodes on a near empty tank of gas.  I reset the check engine light, everything seems fine, and then the next time the car is on a long highway trip it goes on again.  Could you please provide suggestions?  Thank you.

Answer
Using one quart in 1000 miles is considered normal oil consumption, you are below that. Check for any exhaust or intake air leaks, check for loose or disconnected vacuum hoses and the intake hose connected to the throttle body, if no leaks are found replace the MAF sensor.

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Ted Ritter

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I have more than 28 years experience as toyota technician, I will be able to answer most questions related to the Toyota product line up to the present year models,I am located in the US but welcome questions from other regions of the world. When asking a question please provide specific information: year,model, engine,transmission information. Provide as much information as possible including a brief repair history if possible. I have been a volunteer here for almost ten years an have answered over 16,000 questions helping Toyota owners with their problems without any compensation, some of my answers are published on many other websites via google and other search engines. AllExperts recently added a new feature which allows questioners to donate to experts on the site, any amount of donation is very much appreciated, to make a donation just click on the DONATE button.

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Toyota technician since 1979,expert in electrical systems,OBD systems,engine repair, driveability problems,EFI systems,ASE certified,Toyota master technician.
Certified Hybrid Vehicle technician.

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Toyota master technician, ASE certified in eight catagories, Hybrid vehicle certified. Toyota technical training: Engine Automatic transmission Manual transmission Drivetrain Electrical systems Brakes and chassis Air conditioning Engine performance and diagnostics Hybrid systems

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