Question about 1997 Ford Expedition

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Lean fuel mixture code. Both banks. Where is the o2 sensor located? I changed air and fuel filters. Low idle control was bad, replaced it. Changing spark plugs, not done yet.

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Air Filter, Fuel Filter,Plugs,Idles Solenoid or Valve, not the issue.
Use logic and know what the parts your about to change do!
O2 Sensors are in the converters or exhaust pipes near it.
The Codes don't mean there bad or to replace something. That is not what codes are for.
While you may have a worn O2 Sensor,you may also have a vacuum leak, that is driving the sensor out of range and setting the codes.

You never said what your drivability issues were!!

Posted on Aug 27, 2010

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I changed my mass air flow sensor and still wouldn't start put code reader back on gave me same code po174 but now tells me that my oxygen sensor or O2 sensor bank 2


code p 0174 refers to system too lean--bank 2===causes ---intake /exhaust leak---fuel pressure/ pump---injector/s ---AIR system---hose connections
Replace the heated oxygen sensor (HO2S) in the exhaust manifold before the cat converter bank 2 as it is the principle controller of the air/ fuel mixture

Jan 28, 2018 | Cars & Trucks

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I have a PO171 code on my 1999 Jeep grand cherakee larado can You tell me how to fix it, Thank You.


  • Dale, code P0171 fuel system too lean
  • Possible causes
  • change fuel filter first, if it has not been done recently
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP INLET STRAINER PLUGGED
FUEL PUMP MODULE
O2 SENSOR
O2 SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
O2 SENSOR HEATER OPERATION
TPS VOLTAGE GREATER THAN 0.92 VOLTS WITH THROTTLE CLOSED
TP SENSOR SWEEP
MAP SENSOR OPERATION
ECT SENSOR OPERATION
ENGINE MECHANICAL PROBLEM
FUEL FILTER/PRESSURE REGULATOR (HIGH)
PCM
Check the attached links,
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

2000 Jeep Grand Cherokee p0171

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P0171 System to Lean Bank 1

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Failed emission test, codeP2177,P2187,P2188 & P2195 what are these code


What make , model , an year vehicle ? These codes can mean different thing's for different make vehicles

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2003 pickup. What are the probable causes of DTC P0171?


Since you have replaced the sensor, my first guess would be low fuel pressure or a vac leak.
Code 171 means the computer can not make the fuel mixture rich enough to make the sensor switch from lean to rich and back.

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Check engine lights on 99 ford ranger ODB codes 3- need solutions before in shop takes me to the bank help #1- P1506 #2- P1131 #3- P0171 I already know what they mean, got them written down. Need...


DTC P1506 is set when the PCM detects the engine idle speed is greater than the desired rpm. This is most commonly caused by a dirty or bad IAC valve. Cleaning the throttle body will, most likely, cure this problem.

p1131 means that the bank #1 O2 sensor, the bank closest to the firewall, cylinders 1-3 is showing a lean mixture. Could be a vacuum leak, a misfire on that bank, an exaust leak upstream of the O2 sensor, fuel control or injector problem on that bank, a faulty O2 sensor, faulty PCM, faulty wiring in the engine control wiring harness.

P0171
In the vast majority of cases, simply cleaning the MAF sensor does the trick. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling also Inspect all vacuum and PCV hoses, replace if necessaryCheck for a dirty fuel filter and proper fuel pressure

May 19, 2010 | 1999 Ford Ranger SuperCab

2 Answers

Codes P0171, P0174, P0440


This is usually an oxygen sensor, replace the O2 sensor located above the catalytic converter before replacing the evaporator purge canister.

Dec 29, 2009 | 2000 Chevrolet Silverado

2 Answers

A po171 code came on my scanner i need to know


system too lean in bank 1. clean your mass airflow sensor, replace fuel filter. iff all else fails check you fuel pump.

Nov 06, 2009 | 1998 Ford Contour

1 Answer

My 02 impala needs excessive fuel all of a sudden. the MAS sensor and air filter was replaced recently. It also runns a little hotter then usual


The O2 sensor should be replaced as a precaution, running hotter indicates a lean air/fuel mixture, the car should be throwing aOBD II code have the codes checked at Autozone to confirn the Oxygen sensor is bad it should read something like bank one sensor or O2 sensor malfunc.

Jul 14, 2009 | 1999 Chevrolet Malibu

2 Answers

1996 s10 2.2 engine starts but idles rough and will not rev up.


Hi! You must be frustrated by now! your code is marking that the O2 sensor is bad in bank 1. Did you replace the O2 sensor that is located  before the catalytic converter?  The S10 has an O2 sensor specially made for that cat. its about 30$ That would explain for your blackened spark plugs; your pc on the car is asking for more fuel. GOOD LUCK!!

Apr 29, 2009 | 1987 Chevrolet Blazer

1 Answer

20 mpg down to 11 mpg !


Replace your bank 1 (that's the cylinder bank with cylinder #1 in it, usually passenger side but verify this before changing parts) primary oxygen sensor. This is the one before the catalytic converter. The primary determines your air/fuel mixture, and if it goes bad, the computer will revert to preprogrammed fueling maps, which are fuel-rich by design (to safeguard the engine). Change the O2 sensor on bank one, before the cat, and maybe check your spark plugs as well (running rich too long will foul them) - for the minimal cost, it's worth changing them too.

Aug 29, 2008 | 1996 Plymouth Grand Voyager

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