My 4-cylinder 97 Camry is showing a check engine light, and when Autozone scanned it, it was showing only a P0171 code (fuel-air mixture too lean).
There aren't any other codes, and I haven't noticed any reduced performance or exhaust leak noise. Nothing looked out of the ordinary under the hood, except that the Intake Air Temperature sensor on the air filter box had pulled away by maybe an eighth of an inch.
Several people in various internet forums said to clean or replace the MAF sensor on 6-cylinder Camrys, but they don't say what to do for 4- cylinder Camrys which have an MAP sensor instead. Can the MAP sensor be cleaned? Should it be replaced?
Should I try cleaning out the EGR valve?
Should the fuel filter be replaced? Are there other causes of low fuel pressure? Autozone sold me a bottle of Gumout fuel cleaner. Could that help? I don't drive much -- I fill up once a month or less. Could the fuel cleaner cause problems if I don't use up the tank of gas quickly enough?
Jimmy