Failed smog check. OBD Fault code is P0171. I am looking for a diagram of the vacuum system and info on the most common vacuum leaks the Echo has.
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.
I was told by an reliable source to only use CRC mass air flow sensor cleaner only! never brake cleaner PS damaged mine! replaced 2 years ago lesson learned!
it passed smog in 2011 iwth replacement of MAF
had code P0171 2000 Toyota Echo
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Sounds like i have a vacuum leak in my 2000 echo. when i rev the engine then let go of the pedal it sound like almost a pressure release valve is purging air.
Hope this helps?
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You R THE BOMB! Thank you soooooo much.
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