Question about 1999 Ford Ranger SuperCab

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Engine light is on and when checked it says its running lean

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I would get it checked out before doing any major damage. could be a weak fuel pump, bad fuel regulator or a number of other things. running lean can do serious damage to your engine, so i wouldn't drive much until you get it diagnosed.

Posted on Feb 05, 2010

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What is the P**** code?? Could be Lambda switching fault

Posted on Feb 05, 2010

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Posted on Jan 02, 2017

SOURCE: Engine codes run on 2004 Freestar

Make sure you have all the vacuum leaks repaired.
Disconnect the battery for two mins,codes my clear.
The codes you got are O2 Sensors,because of the vacuum leak,which leaned out the readings and set the codes.

Posted on May 03, 2010

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SOURCE: 24 valve engine check engine light comes on saya

there is an elbow under the throttle body area that is the pcv line.
it will get soft and colapse and leak vaccum. check for it closely

Posted on Aug 09, 2010

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I have 1993 pontiac bonnevile, it will not pass emissions the nox levels are to high this is the fourth try. what can i do. also my check engine light comes on as well.


high NOX indicates your engine is running high combustion temps. Two of the major reasons for lean mixtures are intake leaks and clogged fuel injectors. The reason the engine computer cycles between rich/lean when running is because the cat needs lean mixtures to deal with HC and CO and a rich mixture to deal with NOX. If you are running lean the cat can't lower your NOX. I would first get your fuel injectors flushed and de-carbonize your intake/combustion chambers.

May 31, 2011 | 1997 Pontiac Bonneville

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I have a 97 wrangler 2.5. Check engine light is on, running lean, loss of power and high fuel consumption. I have replaced the o2 sensors, reset check engine code. light stays off and engine runs great for...


Something odd about what you posted. An engine that is running lean shouldn't be using a lot of fuel. Lean is when there isn't enough fuel going into the engine. Two other sensors that regulate fuel flow are the map sensor and throttle position sensor. Temp sensor generally would cause a rich condition but I'd test that too. Be sure to check for vacuum leaks at the manifold and lines as well as fittings... A vacuum leak will give the O2 sensor a lean reading...seeing that, the computer will try to compensate by adding fuel. Clearing codes can change the way it's running but as soon as the computer runs through it's internal diagnostics it will turn the light back on if there is a problem.

Mar 24, 2011 | 1997 Jeep Wrangler

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99 toyota camary check engine light going on and


fuel fault o2 sensor putting check engine light on? running rich and lean check for codes get back to me

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Engine codes run on 2004 Freestar


Make sure you have all the vacuum leaks repaired.
Disconnect the battery for two mins,codes my clear.
The codes you got are O2 Sensors,because of the vacuum leak,which leaned out the readings and set the codes.

May 03, 2010 | 2004 Ford Freestar

1 Answer

My idle kicks on and off when im on the brakes sitting at lights


Car may be running lean, I would check the air filter, and replace if it seems excessively dirty (should be done every few oil changes) and check the 'pipe' that connects the air intake to the engine. If there is a crack or hole, it may cause your truck to run lean. Also, if your check engine light is on, and it is the oxygen sensor, a faulty sensor could give bad feedback to the system and suffocate your engine, making it run too wet and causing it to stall when idling.

Dec 02, 2009 | 2002 Ford Ranger Regular Cab

2 Answers

Check engine light keeps coming on. Lean fuel


A lean code can be caused by several different things. The most common, if you are getting a lean code on BOTH banks, is a dirty Mass Airflow Sensor (MAF) Cleaning the MAF usually fixes it.

If not, it could be caused by anything from a crack in a vacuum line to a bad fuel pump. (Anything that could make the engine run lean.)

Oct 31, 2009 | 1997 Mercury Cougar XR7

1 Answer

Running lean


02 sensor is what causes lean and rich mixture. If it is not correct then 02 sensors beed ti ve reokaced,

Sep 29, 2009 | 1999 Lincoln Navigator

1 Answer

2000 toyota celica lean on bank 3


Get the fuel system checked... if that's not it then your fuel injector is not working as it should...get those checked also...!!!

Jun 23, 2009 | 2001 Toyota Corolla

1 Answer

2001 Tahoe: Hard to start, idles rough, check engine light on.


Flashing check engine light is missfire, fuel pump probably causing multiple tries to start.Having to build fuel preasure,vac leak on one side of intake probably causing rich/lean condition.Also check back preasure to cat ,Sound like you are moving down right track.Mas air flow would probably set lean code bank1 and lean code bank2

Jun 19, 2009 | 2003 GMC Yukon XL

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