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reply to Scott Well the oxygen sensor and map sensor were reading out-of-range, so they probably were defective. Replacing those parts just didn't improve my mpg because of the faulty air temperature sensor. The current mechanic spent two days on my car, checking and diagnosing it...

Finally got the mpg problem diagnosed correctly! Well here I am much later, and I finally got my problem fixed. :D The oxygen sensor and map sensor that a mechanic recommended in January 2012 hadn't improved my gas mileage. Yes, my car was down to about 8 miles per gallon last week. Talk...

Hello, I found a good mechanic who computer-diagnosed my car for $65. The problem was that it was running rich and needed a MAP sensor and oxygen sensor. The engine is fine. Lois

We looked all around the engine compartment and under the car while it was running and couldn't detect any gasoline leaks. That's why I asked if anyone knew about the possibility of these cars somehow leaking within the fuel injection system where we cannot see it. I will try pressing on the...

I've had my 93 corolla since 1999. It runs great, although it's been getting very bad gas mileage. It takes about a half tank of gas to drive 30 miles. I live in the San Francisco bay area. I generally drive like a grandmother; I never "floor it." We already checked the fuel injection...