Question about 2005 Toyota Corolla

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Engine light is on

Too lean bank 1
the code that i got is p0171
iam trying to fix it help:O)

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  • 3 more comments 
  • egomez0515 Jan 21, 2009

    vacuum leak thanks

  • egomez0515 Jan 21, 2009

    2000 frontier 6 Cly crew cab . i put new battery and terminal .battery was bad and terminal and holder broke off and hit the battery .but every thing is new now and it wont start up . it only cranks

  • Anonymous Jan 23, 2009

    engine light (I think) flashes once in a while-I think it is the engine light but not sure as it does not stay on long enough to see

  • juan_lomB Jan 23, 2009

    The engine light (I think it is that but it doesn't stay on long enough to tell)flashes once in a while

  • Anonymous Mar 18, 2014

    bank 1 to 2 lean

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You probably have a vacuum/air intake leak.
With the engine idling, spray very short bursts of starting fluid/ether around the intake and surrounding engine bay and wait a second. If the engine surges, there is an intake leak which you can identify by closing in with the ether.
NOTE:
ALWAYS USE VERY SMALL SQUIRTS IN A DIRECTED AREA AND WAIT FOR IT TO VENTILATE BEFORE TRYING AGAIN ELSEWHERE
Put car outside,
do this in a ventilated area,
dont smoke
have a blanket handy in case of a backfire fire.
DONT spray ether idirectly into the air intake when the engine is running

A bad intake leak is audible by a hissing sound. A bad rubber hose is often the cause.
Any vacuum hose under the hood can cause this.
The PCV valve which can also cause this code when faulty, should be replaced as a matter of course. its in the valve cover and only costs a coupla bucks. They are easy to fit.
Hope that helps
pls be conservative with the ether its not good for your engine in large doses!!

Posted on Jan 07, 2009

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P0171 ; Fuel Trim System Lean (Bank 1)
P0174; Fuel Trim too Lean (Bank 2)
fuel trim is system to modify injector pulse if system go lean it will go rich when the system is too much lean and is max.rich it code
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Engine check light on error code 1 is P0171 system too lean bank 1 error code 2 is P0174 system too lean bank 2


P0171 system too lean bank 1
P0174 system too lean bank 2
links to information on the codes

it means that the O2 sensors in your vehicle detected a lean condition in their respective banks. this could be caused by a dirty MAF (mass air flow) sensor or a vacuum leak downstream from the MAF sensor

sometimes you can clean the MAF with electronics cleaner or brake cleaner but be sure to take it off the vehicle first. be careful not to damage the MAF while spraying the cleaner, and allow it to dry completely before installing it on the vehicle.

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SES light on code P0171, 2005 Xterra, what to do??


P0171 is a lean oxygen sensor code for bank 1 on your engine.
It indicates that there is a lean condition (engine not getting enough
fuel or getting too much air) on that side of your engine.
Bank 1 is always the side of the engine where #1 cylinder is
located. In your case it is front-most cylinder on the right side
of the engine. (As viewed from the driver's seat)
So bank one is the passenger side.

If there are any other engine control codes, you need to fix those
first, as they may be the cause of the lean condition.

If that is the only code you are getting, then diagnostic testing
needs to be performed to determine the actual cause of the problem.

Possible causes are:

* Intake air / vacuum leaks
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* Incorrect fuel pressure (Likely to cause both P0171 and P0174 at the same time)
* Low fuel volume (Pressure OK) (restricted fuel filter,etc.)
* Fauly Mass Airflow Sensor
* incorrect PCV hose connection
* Exhaust gas leaks
* Faulty Air Fuel Ratio Sensor

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1 Answer

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P0171 System Too Lean Bank 1
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P0174 System Too Lean Bank 2

OK, that's a partial list of codes, the fuel delivery is controlled by the oxygen sensors, so it's possible that something in that area could be causing your problem.

However, it could also be clogged fuel injectors that can't deliver enough fuel to the cylinders compared to the air that is pulled into the engine.

Try some fuel injector cleaner for that poured into the gas tank.

How does it run?
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P0174 - System too Lean (Bank 2)
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i could only find the 2 codes for you
try here
www.engine-light-help.com
what kind of shape are your plug wires in ?

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