Question about 2007 Subaru Impreza WRX STI Limited Sedan

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Check engine light code says bank one is running lean, what can i do

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  • Contributor
  • 27 Answers

Look for vaccuum leak

Posted on Sep 15, 2010

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Posted on Jan 02, 2017

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SOURCE: check engine light on

Check out this site as it tells you exactly the problem http://www.obd-codes.com/p0171
Hope this helps

Posted on Jan 15, 2009

  • 52 Answers

SOURCE: bank 1 burning to lean check engine light on flunked state emissions

It is a common problem, you will have to change bank 1, o2 sensor as it is covered in burnt oil and fuel telling the computer to run lean.
hope this help

Posted on Jan 17, 2009

  • 1861 Answers

SOURCE: CHECK ENGINE LIGHT CAME ON P0171 FUEL TRIM BANK1 SYSTEM TO LEAN.

Hi. You need to clean the Mass Air Flow Sensor.
This is an easy job.
Get a can of throttle body or brake cleaner spray at your local auto parts store.

Open the hood, and locate the air filter box. follow the tube from the filter box towards the engine. Look for a small black box with 2 screws holding it to the air tube, Remove the wire connector and observe inside the sensor with a flashlight. You will see 2 small wires, and they will appear fuzzy or dirty. Spray the interior with the cleaner until the wires are nice and clean. Do not use compressed air, you will damage the sensor. Put it all back together and drive it.
This will def fix your issue. This is a vey common problem. If you do it yourself, you will save 70 + bucks.

Thanks for choosing FixYa, and a FIxYa rating for my assistance would be greatly appreciated.

Posted on Jan 23, 2009

  • 290 Answers

SOURCE: the code of p0171 ,how to fix

You can try cleaning the MAF first:
http://www.fordf150.net/howto/clean-maf-mass-airflow-sensor.php

If the code comes back after clearing it, check the spark plugs (not an easy task). My 2000 Expedition had fouled plugs....the 5.4 has a bad head design with recessed spark plugs.

Posted on Jun 24, 2009

CaptainKeyz
  • 202 Answers

SOURCE: have this code PO171, what does this mean.

Not sure that the O2 sensor was bad. It sounds like it was telling you that side of the exhaust system was picking up a lean mixure at the O2 sensor. The O2 sensor was doing its job by telling you the mixture changed. If the O2 sensor was bad, it would say low voltage range for that sensor, or open curcuit.
Now the car has had time to do its diagnostic sweep, it is telling you the same thing, but from a different sensor...the fuel mix is too lean. Air/spark/and fuel is what you need in the correct amounts. In your car, the ECM engine control module controls this by taking readings from all the sensors several hundred times a second.
Mechanically, you have a few options. Change the fuel filter...under the car on the passenger side. It is an easy job.
Change the fuel pressure regulator. This keeps the fuel at 4 BAR so the fuel injectors can do their job correctly. This job just needs a screw driver to pop off the clip that holds it in place. No hoses need to be removed. It is on top of the intake manifold, in-line with a metal fuel line and a rubber one.
The fuel injectors could be clogged up on one side of the engine. Run some fuel injector cleaner through a tank of gas. Also, listen for a constant ticking sound at each injector. If one sounds off PAR, then replace it.
The fuel pump may not be giving you enough power. However, the readings seem to be localized to one side, so I doubt it.
Start with the easiest thing, and see if it works. Also, you will need to get yourself a VAG scan tool. It is the only one with codes in it for all of your VW systems, not just engine codes like the ODB scanners. You can get a nice one for $50 on-line.
Good Luck!

Posted on Feb 24, 2010

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2 Answers

What does code p1131 mean on a 2001 ford taurus


P1131 Ford
P1131 Ford - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1

Repair Importance Level: 3/3

Repair Difficulty Level: 2/3

http://engine-codes.com/p1131_ford.html

Forum Code

Possible causes

- Faulty Oxygen Sensor

- Vacuum leak affecting bank 1 only

- Fuel injector problem bank 1

- Check for cylinder misfire on bank 1

- Engine mechanical condition

Tech notes

Though the Oxygen (O2) sensor, the Engine Control Module (ECM) has detected a lean system, which means that there is either not enough fuel or and excessive amount of air in the system. Start by checking for vacuum leaks.

When is the code detected?

The Engine Control Module (ECM) detected bank 1 oxygen (O2) at its lean limit

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

P1131 Ford Description

A Heated Exhaust Oxygen (HO2S) sensor indicating rich at the end of a test is trying to correct for an over-lean condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.

Read more: http://engine-codes.com/p1131_ford.html#ixzz3izk89wMu

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Code 174 is for the fuel system on bank two being too lean. Bank two is the side with cylinder two on a V6 engine.
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Running lean on both banks? Check intake tubing/hoses for loose clamps and cracks/tears aft of the mass airflow sensor. Could also be a fairly large vacuum leak.

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Disconnect the battery for two mins,codes my clear.
The codes you got are O2 Sensors,because of the vacuum leak,which leaned out the readings and set the codes.

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hope this is a bit of a push in the right direction ...

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Check Engine Light Problem


Codes that tell you your engine is running lean can be caused by a number of things. First thing to do (and cheapest) is to get some fuel injector cleaner and run it for awhile. Dirty injectors can cause these codes. I recommend lucas brand myself but there are several different cleaners to choose from. The second thing is checking your vacuum lines. If there is a leak it can cause the engine to **** in too much air and cause the codes. Anything beyond that gets into alot of mechanical work and should be done by a certified technician

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Possible failed bank 1 sensor 1 oxygen sensor..

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3 Answers

Bank 1 burning to lean check engine light on flunked state emissions


It is a common problem, you will have to change bank 1, o2 sensor as it is covered in burnt oil and fuel telling the computer to run lean.
hope this help

Jul 07, 2008 | 1997 Ford Expedition

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