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DTC 171 (system adaptive fuel to lean bank 1). 2001 Taurus DOHC engine. What does this mean and how to fix it?

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 1998 Ford Taurus SE---171,000 KLM..... code P0 171

hi, this code refers to an engine fuel mapping strategy designed to monitor air flow going into the engine and exhaust flow out of the engine to prevent any vacuum leaks, rich fuel conditions, or clogged/open air induction systems that will cause failure of emissions control or catalyst failure. the pcm monitors long term and short term fuel trim to compensate for rich or lean combustion. if the long term fuel trim reaches limits of 15 percent adaptation either positive or negative, the codes p0171, p0172,p0173, p0174 and p0175 will be set depending on which condition is happening. generally, p0171 tells of extra lean combustion occuring on bank one(on your vehicle, it will be the half of the engine that is furthest towards the front of the engine block, where cylinder one is located, i think the rear bank of your engine) okay, look for air tube cracks and leaks btween the mass air flow sensor and the throttle body, look for spongy vacuum hoses that close under vacuum, look for obvious vacuum leaks, check the evap purge control solenoid hose, commonly leaking here, also check pcv valves to make sure they are not blow out. if all tests okay, next step is to check the intake manifold for vacuum leaks, cracks in the gasket, etc. if okay here, check fuel pressure, maybe clogged fuel filter causing low flow, clogged fuel injectors, and bad fuel pressure regulators can occur. if all checks out okay, check the mass air flow sensor by removing from housing and physically looking at the intake air side(the side that recieves air from the filter) for dirt and contaminates. you can check this first if you like, also common problem. ford does not recommend to clean this sensor, only replace if contaminated. but you can try to clean with brake clean just as a test to see if it helps, just don't overdue the amount of cleaner, little goes a long way. if all this tests and looks good, go see a ford dealer! the last step of the diagnostic strategy is the test pcm(engine computer), don't do it yourself, take it the dealer. good luck!

Posted on Jun 17, 2010

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motor1258
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SOURCE: code 171 - System Adaptive Fuel Too Lean Bank 1

Check under driver seat area near frame for filter.

Posted on Dec 30, 2008

  • 52 Answers

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

1fastbob
  • 301 Answers

SOURCE: my 2001 cadillac deville keeps giving me dtc code system to lean

Anytime I get a too lean DTC I first change the fuel filter if it hasn't been changed in awhile. You'd be surprised how many times this has helped.

Good Luck with it.

Bob

Posted on Oct 22, 2009

  • 68 Answers

SOURCE: 97 Mercury cougar xr7 v6. po443, po430, po171, po174,

Sounds like you have low fuel supply or a leak in intake system causing lean codes, check fuek pressure and volume first. Cat converter effeciancy could be caused by the lean codes, purge system sounds like solenoid failure, check for high resistance accross purge vent solenoid.

Posted on Mar 08, 2010

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06 Cadillac STS V8 car has codes P0174 and P0420.


• DTC P0171 Fuel Trim System Lean Bank 1
• DTC P0174 Fuel Trim System Lean Bank 2
.
The engine control module (ECM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. Fuel delivery is controlled differently during Open and Closed Loop. During Open Loop, the ECM determines fuel delivery based on sensor signals without oxygen sensor (O2S) input. During Closed Loop, the O2S inputs are added and used by the ECM to calculate short and long term fuel trim (FT) fuel delivery adjustments. If the O2S indicates a lean condition, FT values will be above 0 percent. If the O2S indicate a rich condition, FT values will be below 0 percent. Short term FT values change rapidly in response to the heated oxygen sensor (HO2S) voltage signals. Long term FT makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1. If the ECM detects an excessively lean condition, DTC P0171 or P0174 sets.
Diagnostic Aids
• Excessive resistance in the fuel injector ignition 1 voltage circuit or the fuel injector control circuit may cause the following symptoms:
- Lean condition
- Misfire
- Rough idle
• The system will go lean if an injector is not suppling enough fuel.
• A lean condition could be present during high fuel demand.
• A malfunctioning MAF sensor can cause this DTC to set. Refer to DTC P0101 .
• Review the Failure Records with a scan. If an intermittent condition is suspected, refer to Intermittent Conditions .

DTC Descriptors
This diagnostic procedure supports the following DTCs:
• DTC P0420 Catalyst System Low Efficiency Bank 1
• DTC P0430 Catalyst System Low Efficiency Bank 2

This code could mean the catalytic converter on that bank has failed .

Causes of lean condition trouble codes P0171 P0174 GM 5 3L

P0420 P0430 catalytic converter catalyst inefficiency code diagnosis

Mar 28, 2018 | 2006 Cadillac STS

1 Answer

What is the probable cause(s) of DTC P0171?


Well code 171 means the computer thinks the fuel mixture is too lean on bank one. Bank one is the side with cylinder one.
The problem could be low fuel pressure, or a faulty O2 sensor among other things.

Jun 14, 2015 | 1997 Oldsmobile 88

1 Answer

What is Pc171 Code


It's P0171 & P0174 not Pc 171 & Pc174 ! The engine computer has detected a lean condition ! That mean's it's not getting enough fuel or has a vacuum leak , bad O2 sensor ! fuel pump getting weak . fuel pressure regulator weak !
P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. Refer to Section 1 , Powertrain Control Software, Fuel Trim for more information. Air Measurement System
  • MAF sensor (contaminated, damaged, malfunctioning, etc.)
Fuel System
  • Fuel pressure regulator (leaking, malfunctioning, etc.).
  • Fuel filter plugged, dirty.
  • Fuel pump (weak, check valve leaking, etc.).
  • Leaking/contaminated fuel injectors.
  • Low fuel pressure or running out of fuel.
  • EVAP canister purge valve leaking (when canister is "clean").
  • Fuel supply line restricted.
  • Fuel rail pressure sensor (incorrect reading).
Air Induction System
  • Air leaks after the MAF.
  • Vacuum Leaks.
  • PCV system (leak, valve stuck open, etc.)
  • Improperly seated engine oil dipstick.
Exhaust System
  • Exhaust leaks before or near the HO2Ss (exhaust manifold gasket, mating gaskets, etc.).
EGR System
  • EGR valve tube/gasket leak
  • EVR solenoid vacuum leak
Secondary Air Injection
  • Damaged/malfunctioning secondary air injection system (mechanically stuck valve).
  • P0174 - System to Lean (Bank 2) The Adaptive Fuel Strategy continuously monitors the fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. Refer to Section 1 , Powertrain Control Software, Fuel Trim for more information. See Possible Causes for DTC P0171. See Diagnostic Aides for DTC P0171
View Freeze Frame Data to determine operating conditions when DTC was set. Observe LONGFT1 and 2 PID(s). Refer to Section 2 , Adaptive Fuel DTCs Diagnostic Techniques for more information.

Feb 12, 2015 | 2002 Ford Escape

1 Answer

I have a 2006 Chevy Colorado..Check engine light on and code 171 came up. Oxygen sensor replaced as was gas cap..Still on..What else needs repairing to fix this??


Trouble Code: P0171

Fuel Trim Too Lean

Possible Causes:


The current cell can be observed using a scan tool.The system will go lean if an injector is not providing enough fuel.A lean condition could be present during high fuel demand due to a fuel pump not pumping enough fuel, plugged fuel filter or a restricted fuel line.Insufficient fuel in the tank or low fuel pressure may cause this DTC to set. Refer to Fuel System Diagnosis .Review the Failure Records with a scan tool. If an intermittent condition is suspected, refer to Intermittent Conditions .

Jan 16, 2013 | 2006 Chevrolet Colorado Extended

1 Answer

PO 171 and PO 174


You did not list a vehicle, so here are the generic codes.
Code 171 is system lean bank one and code 174 is system lean bank two.
The computer is getting a signal from the O2 sensors saying the fuel system is too lean, and the computer can not make it rich.
Possible causes are low fuel pressure, vac leaks, EGR valve problems, and so on.

Jul 27, 2012 | Cars & Trucks

1 Answer

Im getting codes 171, 174, 300, 316 from an OBD II for my 2005 Ford Taurus. What could be causing these?


171 system to lean bank one, 174 to lean bank 2, 300 multiple miss fire,316 crank sensor defective. Does it run rough? Replace crank sensor first.

Feb 07, 2010 | 2005 Ford Taurus

4 Answers

Check Engine light is on my 1997 F150 with a small V-8. The tester returns codes P0171, P0172, P0174 and P0175. What does all this mean?


those codes are for lean engine condition look for vac leaks at the back of engine to the pcv valve could hear hissing noise with engine running also check egr valve to be stuck open also when was last fuel filter changed? hope this helps .

Sep 16, 2009 | 1997 Ford F150 Regular Cab

1 Answer

Check engine light on computer codes 171 174 171-HEGO sensor unable of snitch cylinder bank #1 fuel system at adaptive limit (1990 on) code 174 hego sensor snitching too slow, cylinder bank #1 (1990)


switch, we run off snitches. 171 174 banks 1 & 2 Lean. Most likely cause are Upper Intake Manifold Gaskets, failed seals. It's not 1990 on. It's 1996 and on OBD2.

Aug 03, 2009 | 2003 Ford Explorer Sport

1 Answer

Code po 171 system lean on bank one what would cause this and what would the solution be on a 2002 buick lasabre


DTC P0171 and Po174 indicate air/fuel ratio is correcting rich for an overly lean condition. You could have several things causing this 1. fuel system malfuntion 2. EGR system malfunction 3. Air intake vacuum leak 4. Engine oil level to high 5. Incorrect cam timing 6. Restricted air cleaner 7. Faulty PCV system 8. Excessive internal engine wear.
Sorry I could not be more specific. Check for the easy things in this list. Most of the time one of the o2 sensors in bank one has failed and not reading correctly. Same on the 02 Lesabre.

Mar 01, 2009 | 1998 Ford Crown Victoria

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