Question about Toyota ECHO
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Posted on Jan 02, 2017
A P0171 code does not indicate a vacuum leak; it indicates a dirty mass air flow sensor. This device is located between the air filter box and the intake manifold. Locate it, unplug the wire harness, and remove the 2 screws that holds it onto the intake pipe. Look down inside th sensor, you will see 2 small wires, that are probably covered with fuzzy things...using a spray cleaner, such as brake cleaner, spray the 2 wires until they are clean and shiny. Do NOT use compressed air, that will damage the sensor. When it is clean; reinstall it and drive it. The computer will recognize the now clean sensor, and your troubles will be over.
Posted on May 19, 2009
SOURCE: PO172 system too rich bank
You need to have the fuel pressure checked, if this is ok you then need to check the valve clearances and once this is done then have the DTC rechecked.
If the P0172 code comes back then you need to check injector pulse timing and then replace the faulty injector.
Let me know if you need more information.
Posted on Feb 28, 2011
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