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Obd codes p0171 and p0174 Fuel trim system lean

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Check for a vacuum leak or clogged fuel filter .These are lean codes and both of these problems will cause this code:)

Posted on Jul 30, 2009

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Posted on Jan 02, 2017

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Vehicle CEL is on, various codes


P0300 is a random miss fire , a vacuum leak can cause this as well as low fuel pressure ! weak fuel pump , clogged fuel filter !
DTC P0171: Fuel Trim System Lean Bank 1
DTC P0174: Fuel Trim System Lean Bank 2 These two codes are saying the PCM - engine computer is see a lean condition .
DTC P0191: Fuel Rail Pressure (FRP) Sensor Performance
Circuit/System Description
The fuel pressure sensor is located on the fuel line. The fuel pressure sensor monitors the fuel pressure in the fuel line. The fuel pump flow control module (FPCM) monitors the voltage signal from the fuel pressure sensor.

You don't say what make , model an year vehicle ! These are for GM vehicles , yours could mean something else . Except the first three , those are genaric codes , same for all makes ! So can't say what this codes are P2097, and P2099 ! Can't mean this P2097 - Post Catalyst Fuel Trim System Too Rich Bank 1
P2099 - Post Catalyst Fuel Trim System Too Rich Bank 2

Sep 03, 2016 | Cars & Trucks

1 Answer

Im getting P0171 code- lean .


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Jan 27, 2016 | Cars & Trucks

3 Answers

Code p0171 and p0174


P0171 possible cheap fix

Feb 21, 2015 | 2002 GMC Sierra 1500

1 Answer

4 Codes in computer


code p0128 indicates a mechanical fault ( could be the thermostat stuck open)
code p0174 -system too lean -bank2 ===causes --intake /exhaust leak--fuel pressure/pump--injectors--AIR system--hose connection/s
code po171 refers to system too lean bank 1 same as po174 with the HO2S sensor being the culprit. As to all being related . only by way of the o2 sensors
code p0442 is not connected to the first 3 as it is in a different section of the fuel system

Apr 09, 2014 | 2003 Saturn VUE

1 Answer

Engine light on


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
look for 02 sensor bank 1 and 2 data
hope it helps

Mar 31, 2014 | 2003 Chevrolet Malibu

1 Answer

I have a 2005 Ford Taurus SE (Flex Fuel), 3.0L, OHV. I recently had my A/C compressor replaced due to a clutch disc failure. The new compressor/clutch works great, engages/disengages properly, and blows...


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Hi,

I'm Ben and -- hopefully -- I can provide some meaningful assistance.

In my opinion, the problem lies with you P0174 reading. I'll explain.

OBD II Fault Code

OBD II P0171
OBD II P0174

Fault Code Definition

OBD II P0171 Fuel System Too Lean (Bank 1)
OBD II P0174 Fuel System Too Lean (Bank 2)

Symptoms

  1. Check Engine Light will illuminate
  2. In some cases, no adverse conditions may be noticed by the driver
  3. In other cases, there may be performance problems, such as a lack of power on acceleration and some "coughing" or misfiring
  4. The vehicle may have trouble idling, especially when warm or when sitting at a stoplight

Common Problems That Trigger the P0171 and P0174 Code

  • PCM software needs to be updated
  • Vacuum leaks (Intake Manifold Gaskets, vacuum hoses, PCV hoses, etc.)
  • Mass Airflow Sensor (MAF)
  • Plugged Fuel Filter or weak Fuel Pump
  • Plugged or dirty Fuel Injectors

Jun 23, 2012 | Cars & Trucks

2 Answers

Yukon Denali Fuel Trim bank One and Two running too lean?


Could also be fuel filter, pressure, vacuum leak, etc. Check these two articles out, they should help too - http://www.obd-codes.com/p0171 and http://www.obd-codes.com/p0174

Dec 21, 2008 | 2002 GMC Yukon Denali

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