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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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Bill Boyd

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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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Anonymous

  • 141 Answers

SOURCE: PO 171

Bank 1 O2 sensor.

Posted on Jan 12, 2009

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Anonymous

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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

Titilayo Sodipe

  • 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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2 Answers

Po 171, po 305, po 441


Hi, I know from my past experiances the spark plug wires at the boot ends than slide onto the sparkplugs usually over time short out due to the metal tubes that protect the sparkplugs from heat kind of ark across from the metal tube through the plug boot causing an error code. Sometimes in the dark you can actually see them arking at the tube on the engine, and also hear a crackling noise. As to the code for the O2 sensor that's a normal wear and tear item that may need replaced. As all vehicle age over time electrical connections, and things have issues develop and cause havick with sensors and computers in these vehicles too.


As with the 441 code and then the other code for the O2 sensor showing up may mean both O2 sensors are going bad if your system has 2 sensors in the exhaust, usually one before the cat converter and one behind it. A lot of this also is due to what gasoline you use in the vehicle over time. Lower octane gas may be what is causing things to act up.

Jan 03, 2014 | Dodge Ram 1500 Cars & Trucks

1 Answer

Coaster idling high and high fuel consumption


Water temperature is low cost oil is certainly the easiest way is with a hard shell to block part of the warming effect of the radiator well as for how much you want to try to stop. Idle temperatures will rise up relatively low. What is the pull speed? Not run fast but continues to run uninterrupted some time. Usually two hours can be. Is to allow the engine to reach full swell purpose. Such a shift is to be based on the vehicle speed and the reference engine speed. Not based on the engine speed. Driving is probably the single 30 towards third gear, fourth gear towards forty, fifty five-speed ahead. Many people on the car ahead of change. As long as the engine sounds smooth, no trailer can be.

Dec 11, 2013 | Toyota 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.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

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

2 Answers

Error codes po 134 po 153 po 154 po 155 po 171 po 174


PO 134 = 02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR1)
PO 153 =02 SENSOR CIRCUIT SLOW RESPONSE (BANK 2 SENSOR 1)
PO 154 =02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 2 SENSOR 1)
PO 155= 02 SENSOR HEATER CIRCUIT MALFUNCTION (BANK 2 SENSOR 1)
PO 171= SYSTEM TOO LEAN (BANK 1)
PO 174= SYSTEM TOO LEAN (BANK 2)
I WOULD SAY YOU HAVE FAULTY OXYGEN SENSORS CAUSING THE ENGINE TO RUN TOO LEAN REPLACE THEM AND YOU SHOULD BE BACK IN BUISNESS

Feb 23, 2011 | 2004 Suzuki Grand Vitara

1 Answer

What is code po 171 bank too lean


bank too lean mean the engine get not enough gas to burn. computer says that because if the gas not enough, u might get the combustion chamber to get overheated and melt the piston down or anything inside it.

Nov 09, 2010 | 1991 Lexus LS 400

2 Answers

Subaru forester PO 171 code


Your fuel system is too lean. It's typically the primary O2 sensor (on the pipe between the engine and the catalytic converter). The mass airflow sensor is also possible but the O2 sensor is a wear item requiring periodic replacement and is more likely.

Jul 14, 2010 | 2005 Subaru Forester

2 Answers

Code PO 171


http://www.automotiveforums.com/t473813.html

PO 171 is a system to lean code. This link will explain why this is and how to fix it,

Mar 02, 2010 | 1998 GMC Sonoma

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

How to fix error code po171


i strongly believe it is your fuel pump

Jul 01, 2008 | 2003 GMC Sonoma Extended Cab

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