Question about 1997 Ford Expedition

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Bank 1 burning to lean check engine light on flunked state emissions

I flunked state emissions have a check engine light on code tells me bank 1 is burning to lean 1997 expedition 5.4 v-8

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  • Anonymous Jan 27, 2009

    lean banks 1 and 2 on 2002 ford windstar. please define the engine diagnostic code

  • lexa34 Feb 09, 2009

    how do you clean or replace the o2 sensor?

  • Anonymous Mar 08, 2013

    Oxygen Sensors can not be cleaned They are replaced at 100,000 or when they fail The just screw into the exhaust pipe before the converter & on some fords in the inlet Use 22mm wrench

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It is a common problem, you will have to change bank 1, o2 sensor as it is covered in burnt oil and fuel telling the computer to run lean.
hope this help

Posted on Jan 17, 2009

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Check for vacuum leaks, plugged fuel filter, and if that don't do it check fuel pressure should be 28 to 48lbs if its your fuel pressure is your fuel pump.

Posted on Mar 08, 2013

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In addition of u answers check starter connection and 175 amps fuse, clean up starter and may be change the fuse

Posted on May 24, 2009

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Posted on Jan 02, 2017

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SOURCE: Code #P0171 & code #P0174

The most common problem on a Ford with these codes is deteriorated PCV hoses. Check the hoses from the PCV valve to the intake manifold. Pay special attention to the rubber elbows. They often crack on the inside curve and the crack is hard to see.

Posted on May 22, 2008

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SOURCE: Generic code PO171 system 2 lean bank 1 generic

This can be caused by a faulty mass air flow sensor

Posted on Jul 09, 2010

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SOURCE: Engine running rough at

First, make sure the gas cap is on tight(turn till it clicks) next, check for broken or disconnected
vacum lines around the top of the engine and intake manifold area. also check the vacum lines
to the purge canister and make sure there is no blockage in the lines. If the canister is bad the
charcoal filter material can get sucked into vac. lines and cause the no flow problem. Also check
the elec. connections for the purge valve(in vac.line from can. to intake manifold) and the vent
solenoid at the canister. Hope this helps.

Posted on Nov 19, 2010

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1 Answer

Why would one bank of my engine be running lean?


If check engine light is on. Get it scanned to find the problem code. They will do this at any auto parts store for free, It may be a bad 02 sensor. Get it scanned. A vehicle can fail a state-mandated smog test because a bad, or faulty, oxygen sensor. remove the O2 sensor from the exhaust pipe ahead of the catalytic converter and look for a change in performance. Good-Day!

Jul 25, 2014 | 2010 Buick LaCrosse CXL

1 Answer

Why the check engine light comes on and off runs great


The check engine light is on to tell you the computer has found a problem that will affect performance, gas mileage, or emissions.
Such as the code 171 you asked about.
Code 171 is for the fuel mixture on bank one being too lean. The O2 sensor is telling the computer the fuel mixture is too lean and the computer can not make it rich enough.

Dec 13, 2012 | 2003 Toyota Highlander

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1999 Ford Explorer XLT 4.0 SOHC 4x4 code P1151 bank 1


Ok this is either a shorted wire or bad connector or just plain a bad 02 sensor or a stuck injector or bad PCV needs cleaned. You stated it runs great i would go with Bad 02 sensor first or check for possible exhaust leak and last check for bad converter.

Apr 07, 2012 | Cars & Trucks

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I have 99 Chevy Malibu. My check engine light came on. The original codes were for a cylinder misfire and a small emissions leak. I replaced the injector for the cylinder that was misfiring as well as all...


well if you get it scanned again, and you get a lean bank 1 and 2 code then you may have a intake manifold gasket thats leaking. I just worked on a van that had them codes. and I ended up changing the intake manifold gaskets to get it to pass the emissions test for inspection, I live in new york state, po171 and p0174 are the lean codes. we did the maf sensor, new 02 sensors, egr valve and still got this lean code. good-day and god blessyou. it was on a 99 ford windstar van.

Oct 03, 2011 | 1999 Chevrolet Malibu

1 Answer

1999 chevrolet 1500 with a 5.3 engine engine light on had check had a code in it po171 and po174 sey burning to lean on bank 1 and bank 2 what should i check for did pass inspection


Running lean on both banks? Check intake tubing/hoses for loose clamps and cracks/tears aft of the mass airflow sensor. Could also be a fairly large vacuum leak.

Mar 06, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

Codes


Your sensors are reading correctly so leave them alone. What you have is a fuel delivery issue. Your MAF sensor is telling your engine to lean your fuel mixture. You need to remove and clean or replace (is better) the MAF. But first replace your PVC valve and clean your ERG valve.

Jan 20, 2010 | 2000 Dodge Intrepid

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

Engine light on 3 codes in system


The lean running codes are related to the p-1000 code...

Running lean on bank 1 and bank 2 means your oxygen sensors sense too much oxygen in your exhaust flow. This means either your engine is getting unmetered air (air that the engine does not know is coming in, therefore does not send fuel to compensate for...) (air that your mass air flow sensor does not see). You could have either a bad mass air flow (MAF) sensor (in the intake piping after the filter; this sensor tells your engine how much air it's taking in, so it can send the right amount of fuel through the injectors to properly burn with the air available with as little emissions as possible), or you could also have a cracked/broken intake piping after this sensor which lets air in the intake that the sensor does not measure... A large vacuum leak could also let unmetered air in the engine.

Or... Another possibility here would be low fuel pressure (bad fuel pump, bad fuel pressure regulator, fuel leak), as not enough fuel for the air would also cause the same lean condition.

It could be that some oxygen sensors are bad...

These conditions are hard to pinpoint exactly unless you have a scanner that can read sensor data (MAF Flow, fuel pressure, oxygen sensor values)...

The first thing I'd do would be to check for cracks or damage in the intake piping... If there is none, then it might be a low fuel pressure issue, or sensor problems...

May 08, 2009 | 2003 Jaguar X-Type

1 Answer

Codes #171 & 174


first check out for o2 sensor if its faulty this can show up.but if its proper.Evaporative emission control system leak very small 171 System too lean (bank 1) 174 System too lean (bank 2) 

Jan 05, 2009 | 2004 Ford F150

1 Answer

Check engine light comes on


I looked up code 171 and found 'system lean bank one' Sounds like a fuel injection sensor. countrycurt0

Aug 28, 2008 | 1999 Plymouth Breeze

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