sheli5104

I am taking step by step to figure out what is wrong with my car. My engine light comes on and says "system too lean". My car died on me twice yesterday which scared me. I bought a fuel filter to see if that will help my problem and i have been buying the expensive gas. (Thinking that the regular gas i use is not rich enough) I will be having my dad replace my fuel filter, does anyone know a good website where we can reference to? Does anyone have any feedback? Thank you for your time! I appreciate it!

Brian R.

For P0171 code (easiest and cheapest first)

1. Check your air induction system for leaks or broken hoses/connections.

2. Put some injector cleaner into a tank of gasoline and see if that helps after you've gone through a tank of treated gas.

3. Buy some no-residue sensor or electronic contact cleaner (NAPA or elsewhere). Remove the connector from the MAF meter spray both sides of the connector thoroughly. Spray the cleaner into every possible exposed portion of the MAF meter in the intake tube and let the cleaner evaporate. Reconnect the MAF meter.

4. Test the engine coolant temperature sensor - replace if out of spec.

5. Check the manifold absolute pressure sensor - replace if out of spec.

6. Check your fuel pressure (not too likely to be the problem).

7. Replace the HO2/A-F ratio sensor with the correct sensor (Bank 1 Sensor 1) - Get a part number from a Toyota parts department with your VIN.

8. Replace the MAF meter.

Somewhere along this process, the light should go out and stay out. Most commonly, it is cleaning the MAF meter and connector that solves the problem. Unfortunately, the light can go out for a short period and then reappear - making you think you solved the problem.

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