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Diagnostic code p0171

Po 171 Code Only After Extended Idling, Cold Weather With Heat On High, Looks Like Engine Is Not Heating Up Fast Enough?

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Code p0171 refers to system too lean-bank 1===causes --intake /exhaust leak---AIR system MAF/VAF sensor--fuel pressure /pump/ regulator---injectors--HO2S IF the thermostat working ok then the engine will get hot enough up to 85 degrees minimum. May be you have an air lock in the coolant system or the heater control is not opening the flow control to the heater core properly

Posted on Jan 01, 2014

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Posted on Jan 02, 2017

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SOURCE: PO 171

Bank 1 O2 sensor.

Posted on Jan 12, 2009

baccardo
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SOURCE: PO 171 and PO174 codes but different problem

transmision shifts are based on engine load imputs a 171 and 174 refer to a lean condition therefor the shift is being based on an assumed cold engine so yes it may be related

Posted on Apr 23, 2009

  • 1428 Answers

SOURCE: my check engine light came on 2004 ford taurus had

P174 means Oxygen sensor was slow in switching Single, Right or Rear HO2S - Fuel control

P171 means Oxygen sensor not switching - system was at adaptive limits - Single, Right or Rear HO2S - Fuel control

Visit http://www.troublecodes.net/Ford/
for a comprehensive code listing for your car.

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Posted on Jan 08, 2010

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1 Answer

Po 171 174 codes


code P0171 is ; system too lean (bank1)
code P0174 is . system too lean (bank 2)

Oct 20, 2013 | Chevrolet Cars & Trucks

1 Answer

Check engine lights on code po 171 toyota matrix 2007


There are two common things that cause this code. The first is a dirty MAF sensor. The sensor is located on the side of the air filter cover. It can be removed and visually checked for dirt/debris. If it is dirty it can be cleaned with MAF sensor cleaner. The second is leaking intake manifold gaskets. The engine will need to be cold and a smoker will be needed to check them. The good news is the parts are cheap and they can be done in less that an hour.

Apr 06, 2013 | Toyota Matrix Cars & Trucks

1 Answer

2006 xj8 code po 171 engine light is on


Lean report from right side bank #1 oxygen sensor

Replace both sides upstream sensors if over 100,000 miles

They slow down & set a mil lamp

Leave the rear monitors

Dec 02, 2012 | 2001 Jaguar XJ8

1 Answer

Scanned my computer , came up with a PO 171 and 174 what does this mean?


P0171 AND P0174
P0171 - System Too Engine Cylinder Lean Bank 1xicon.jpghttp://engine-codes.com/p0171.htmlForum CodePossible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection Tech notes Dirty air filter of faulty air flow sensor are common causes for the P0171 code of the problem.


P0174 FORD - Fuel Injection System Too Lean Bank 2xicon.jpghttp://engine-codes.com/p0174_ford.htmlForum CodePossible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection Tech notes The codes is usually set when there is an intake leak after the air flow meter, before replacing any parts check for loose or broken hoses and intake gasket leak. On Ford some models dirty air filter, and dirty or faulty air flow sensor are the cause of the problem.

Jul 27, 2012 | Cars & Trucks

1 Answer

Having over heating problemsand its idling high


Could be a coolant sensor fault. If the sensor cannot detect the coolant temperature it cannot a) trigger the radiator fan to come on and b) cannot inform the ECU and so the ECU continues the fuel rich injection cycle that is used when the engine is cold and starting up and so the engine continues to idle fast during 'closed cycle'. Check the sensor connection and wiring. If all looks well probe the wires with a voltmeter (if it has 4 wires then the pairs that are diagonally opposed are usually part of the same sensor function). Measure the voltage when engine is cold and again when hot, there should be a difference. If not the sensor is fried and should be replaced. Have the DTCs read from the diagnostics, chances are that some of the codes P0115 -P0119 and P0125, P0126 are logged.

Apr 06, 2011 | 2002 Dodge Stratus

2 Answers

I have a 2001 Toyota Corolla with 255K I replaced all 4 injectors with remanufactured OEM Denso injectors (15K warranty that has ran out.) With the following codes about a year ago - PO 171 PO 300 &...


No i would go for the o2 sensors ,two are fitted one before the cat and one after ,use universal ones now the 4 wire ones are 40euros each but the 3 wire ones are 90 euros each, in the box is a wire conversion colour code chart but basicly the two wires the smae colour go together either way around and the other two look at the conversion chart

Jan 07, 2011 | 1998 Toyota Corolla

2 Answers

Code 171 and engine light is on


--BANK 1 = DTCs P0171 (lean) and P0172 (rich)

-Check intake air system for leaks, obstructions and damage.
-Check air cleaner element, air cleaner housing for blockage.
-Verify integrity of the PCV system.
-Check for vacuum leaks.

I would try cleaning the Mass Airflow Sensor first. A dirty Mass Airflow Sensor is a common problem for triggering PO 171 & 174 codes.

Good luck and keep me posted.

Oct 21, 2009 | Chevrolet Colorado Cars & Trucks

1 Answer

Po171 error code


P0171 means the system is lean on cylinder bank number one, with just the one code you could replace the bank one upstream O2 sensor and that will most likely cure the problem.

Aug 27, 2009 | 1999 Chevrolet Cavalier

2 Answers

PO 171 and PO174 codes but different problem


transmision shifts are based on engine load imputs a 171 and 174 refer to a lean condition therefor the shift is being based on an assumed cold engine so yes it may be related

Apr 23, 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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