error code P0171

[1stToyota]

Originally Posted by bronsin

Got this error code on my sons 2000 ECHO. Assume there is enogh commonality with the Yaris to make deductions valid. Book says P0171 can be:

air induction system
injector blocked
mass air flow meter
engine coolant sensor
fuel pressure
exhaust leak
opn/short heated oxy sensor bank1 sensor 1
heated oxygen sensorr

Anyone have any experience with this code? Or have any comments on how to evaluate each component listed? Im thinking its easy to check for exhuast leak.

Did one last week (P0171/P0174)...but it was on a Ford Windstar (front valve cover, PCV valve, isolator bolt kit & intake manifold gaskets)

On the 2000 Echo I think I'd start with a quick look at the MAF meter to see if it's dirty.

[talnlnky]

Originally Posted by 1stToyota

Did one last week (P0171/P0174)...but it was on a Ford Windstar (front valve cover, PCV valve, isolator bolt kit & intake manifold gaskets)

On the 2000 Echo I think I'd start with a quick look at the MAF meter to see if it's dirty.

wow... if he's having issues with the MAF then there's something way wrong with the air filter.... correct?

[1stToyota]

Originally Posted by talnlnky

wow... if he's having issues with the MAF then there's something way wrong with the air filter.... correct? One of those OBDI Karman Vortex Air Flow Sensors that an ex YW member said we had on our Yaris'? Seemed like a few other members agreed about the OBDI sensor being on our OBDII Yaris. LOL

Book says P0171 can be:

air induction system
injector blocked
mass air flow meter
engine coolant sensor
fuel pressure
exhaust leak
opn/short heated oxy sensor bank1 sensor 1
heated oxygen sensorr


Best place to start