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Bank 1 too lean

Check engine light on, code reader says bank 1 too lean

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ALL CARS fixes are guessing and hoping at best. 1st thing is it a 4 cylinder or a v6. if its a v6 and you have bank 1 lean but NOT bank 2 lean, then you are probably looking for a vacuum leak affecting only bank 1. Stuck injector will NOT ause this code without also setting a misfire code. Cars use fuel trim. Basically you have BASE FUEL which is the preprogrammed best fuel amount for each condition. FUEL TRIM is the result of when the o2 sensor analyzes how rich or lean the car was, then adjusts the fuel trim to compensate as needed. Most cars set a trouble code around +/-25% fuel trim. You really need look at datastream on a scantool and determine if BANK 2 is also lean and just not quite at code level (IE - Bank 1 is at 25% and set a code, Bank 2 is at 22% and did not). In this case, tream it as a problem that affects ALL CYLINDERS instead of a bank.
Now that the bank thing is settled, lets presume you have a 4 cylinder. As said before, vacuum leaks are a common cause and should be checked early on. There are many ways to do this, but the cheapest and easiest is open the hood and listen for the air whistling/sucking sound and follow it. Doesnt always work, but you may get lucky.

Posted on Sep 12, 2009

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Vacuum leak, faulty O2 sensor, intake leak or injector stuck. You'll need to run a Volumetric efficiency calcutor or find someone who can, in order to determine the exact cause, combines with a scan tool observation at the same time.

Hope that helps.

Kevin, ASE certified

Posted on Sep 12, 2009

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Posted on Jan 02, 2017

SOURCE: check engine light is on

Look for vacuum leaks,that are causing the O2 Sensors to go lean, and set codes on both banks

Posted on Nov 11, 2010

  • 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

pctech1
  • 1940 Answers

SOURCE: Check engine light is on,

There could be a vacuum leak downstream of the Mass Air Flow sensor or the Mass Air Flow Sensor is dirty or faulty. Try cleaning the MAF sensor wire elements and clear the engine computer code. After removing the MAF sensor, spray the honeycomb inside the sensor, or the air meter with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling. Inspect all vacuum and PCV hoses, and replace any vacuum hoses that have cracks, cuts, etc. If it has been a long time since you changed your Fuel filter, it may be a good time to do this as well. This could also be due to a faulty O2 Sensor.

Posted on Apr 03, 2011

Shorty1_wt
  • 324 Answers

SOURCE: engine check light on error code

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.

Posted on May 21, 2011

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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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2 Answers

Bmw 2882/3 fault codes present


You most likely have an engine vacuum leak or a defective mass airflow sensor or low fuel pressure. Read the codes with a OBD2 code reader and see what the standard codes are.

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1 Answer

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.

May 21, 2011 | 2001 Jaguar S-Type

1 Answer

Rough idle vibrates and po171 code service engine soon. jamesrowland9@aol.com


Hi, a Ford P0171 is a LEAN code for cylinder bank 1, and P0174 is a LEAN code for cylinder bank 2. These codes commonly occur on many Ford vehicles, and are set when the powertrain control module (PCM) sees the air/fuel mixture is running too lean (too much air, not enough fuel).
When the Check Engine Light comes on, either one of these codes, or both, may be found when a code reader or scan tool is plugged into the vehicle diagnostic connector. IF the vehicle is driven long enough, typically both codes will be set.
A P0171 lean code for bank 1 is the cylinder bank on the RIGHT (passenger) side of the engine on Ford vehicles with a V6 or V8 engine and rear-wheel drive.


A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a rough idle, hesitation or stumble when accelerating, and/or poor engine performance.
Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow (because the EGR differential pressure sensor that monitors EGR flow is faulty and is under-reporting EGR flow).
If the problem is not enough fuel, the underling cause may be a weak fuel pump, restricted fuel filter, leaky fuel pressure regulator or dirty fuel injectors.

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1 Answer

I have a 2000 Hyundai Sonata that runs rough when you start it up. I hooked a code reader to it and it said that system was lean on bank 1 and multi misfire and not reading 02 sensor on bank one. I have...


time to get the engine properly scanned, real time not code scanner, then you will have the readings from sensore and actuators, diagnose from there

Dec 14, 2010 | Hyundai Motor 2004 Sonata

1 Answer

Check engine light is on codes are po171 system too lean (bank 1) po174 system too lean (bank 2) so what can i do


Look for vacuum leaks,that are causing the O2 Sensors to go lean, and set codes on both banks

Nov 11, 2010 | 1997 Ford Expedition

1 Answer

CHECK ENGINE LIGHT ON , WITH CODE SYSTEM TOO LEAN


Possible failed bank 1 sensor 1 oxygen sensor..

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