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What is your question?
2000 toyota avalon with check emgine, vsc, vsc off lights on dash. toyota dealer gets $100 just to check codes. when i bring to dealership they have no idea and just say it's a "piece of dust on sensor" 2 weeks later same lights have come on again. this time i have autozone check for codes, P0171 code, 02 to lean, bank 1. any ideas what this means, how fix and reset lights. Thank you.
3 Replies
You definitely have a engine situation making the lights come on. The VSC is being disabled because of the engine code setting. The MAF sensors are very prone to debris and dirt, and will cause that problem to occur, however if its been cleaned and that still didn't help further check out will be required. Some possible issues would include; vacuum leak, A/F ratio sensor, fuel injectors, fuel pressure, fuel filter. It is also possible that there is an updated software calibration that will broaden the monitor parameter's slightly. If it was at the dealer they should have checked for software updates. I can do a little more digging for you at the shop tomorrow. I don't have access to all of my information from home.
It means the engine is getting more air or not enough gas. It needs a fuel pressure test, vacuum leak test, possible MAF sensor. Try Find a Shop on top of this page for a Repair Pal shop in your zip code.