Question about 1998 Toyota Avalon

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Check light on black smoke,fuel consumption,the scan read PO 171 please what is the problem.

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Sounds like a faulty oxygen sensor, telling computer that engine is running lean, so it's dumping more & more fuel to try & correct it. Bank 1 oxygen sensor.

Posted on Jun 04, 2009

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Posted on Jan 02, 2017

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My Hyundai 1999 model CHECK ENGINE LIGHT IS ALWAYS ON AND THE FUEL CONSUMPTION IS HIGH.


Do you have black smoke or what looks like soot coming out of the tail pipe. The check engine light monitors fuel pressure through the computer and pressure regulator. It will come on if the pump pressure is too high or too low. If the pressure regulator is faulty it could cause excessive fuel consumption,

Jan 19, 2015 | 1999 Hyundai Sonata

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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

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

2 Answers

High fuel consumption jeep cherokee 1995 4 litre engine


+ air intake : This will cover the cleanliness of carburetor or throttle body and the air filter. Make sure there is no obstruction in the air intake system and no carbon deposits or dirt. This is the most important part to get better air flow and fuel consumption. also tires, make sure there at proper inflation. please go here to read more because there are numerous causes for this.www. kereta.info/causes-of-high-fuel-consumption good-day !

Oct 21, 2011 | 1995 Jeep Grand Cherokee

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

1 Answer

Check engine light diagnosis shows PO 171 and PO 174, what does it mean. Someone told me I need to replace the fuel filter and fuel cap, is this true


The system is too lean,this ,most of the time means that the fuel pump pressure is not enough,the fuel pump is going out,but change the fuel filter to see if it is the problem,if the fuel filter does not help,replace the fuel pump.

Feb 05, 2010 | 2000 Ford Explorer

1 Answer

My check engine light came on 2004 ford taurus had a friend the plugged one of those code readers in got two codes po 174 and po 171 what do they mean


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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Jan 08, 2010 | 2004 Ford Taurus

1 Answer

PO 171


Bank 1 O2 sensor.

Jan 12, 2009 | 2008 Pontiac Grand Prix

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