Question about 1995 Ford Bronco

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My 1994 bronco runs lean. And i have change the oxygen sensor

I put it on the dianogstic and it say the oxyen sensor but i change it.

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  • 193 Answers

It might have a intake manifold leak. Sucking in enough air the computer can't put enough fuel to compensate. Check all your vacuum lines, and might pull the EGR valve off and inspect. If the EGR sticks open slightly that would make a vacuum leak. I have seen both intake gasket on 5.0 and the 5.8 do this as well as an old EGR valve.

Posted on Dec 06, 2012

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  • 2 Answers

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Posted on Jan 02, 2017

chuck943
  • 783 Answers

SOURCE: bank 1 and 2 running lean on computer scan po171,po174

Doubt it.
It would be highly unlikely for both O2 sensors to go bad. I strongly suspect they are reading what is actually happening,the engine is running lean. Probably from some un-metered air getting into the engine either from a vacuum leak or from a leak somewhere on the engine side of the mass air flow sensor. What usually causes a concern on this vehicle is the orings between the upper and lower intake manifold.

Posted on Mar 25, 2009

  • 14036 Answers

SOURCE: 2003 Sport Trac runs ok above 1000 rpm's but if

scan it check the egr valve.make sure its not staying open.

Posted on May 01, 2009

keithheavili
  • 410 Answers

SOURCE: How many Oxygen sensors in Ford Ranger 1994

There are 2 O2 sensors on your Ford Ranger.  There will be one a foot or two before the catalytic converter and one a foot or two after the converter.  I don't have a diagram but you will only need to look for the identical sensor located up or downstream from the first one that you replaced.

Posted on May 17, 2009

fingaz22
  • 1068 Answers

SOURCE: TOO LEAN CODES

yes very very common code for these motors i get them all the time. now the first thing i do is listen to the pcv valve for noise if it is rattling this is the problem and is the most common of all. another thing is the intakes leak from cracks in them but the only way to find it is with a smoke machine. now the one other thing i have seen before is debre like a leaf in the mass air flow sensor but you have replaced it so most likely no that.

do your self a favor and change the pcv valve it only cost under 5 dollars. if this is not it you will need to find the leak in and around the intake or a vacuum hose.

because you have two lean banks this mean if it is a leak then it has to be in common with both banks and that is the vacuum line system intake etc...

let mew know if you have any more question. good luck man

Posted on Oct 21, 2009

  • 5470 Answers

SOURCE: i have a 1994 ford bronco with a 5.8 351w. when

Take your Bronco to an Autozone or Oreillys for a free scan. Offhand a new ignition switch would seem like a good idea, because the fuelpump should not be working in the ACC position.
If a new ignition switch does not help the fuelpump problem the pump is wired to an accessory. You need to look up the fuse info in an owners manual.

Posted on Dec 01, 2009

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2 Answers

1986 CHEVY CK20 FAILED EMISSION TEST HIGH HYDROCARBONS


mccartlidge. are you serious?? high HC is the result of a headgasket problem??? do everyone a favor and dont give advice when you clearly dont know a damned thing about emissions. as far as solutions to your high HC output, someone else mentioned the possibility of a worn out cat along with carb problems and or a simple air fuel adjustment. this car if i remember correctly has a feedback carb which means it has an oxygen sensor and a mixture control solenoid on the car to fine tune the air fuel mixture. it is not uncommon to have a oxygen sensor not functioning at all or out of normal calibrated range. easy test for oxygen sensor(single wire oxygen sensor ) is to hook up a voltmeter at 0 to 1 volt range(positive lead to oxygen sensor wire, negative lead to any good ground source) and watch the voltage. a perfectly working system the signal should look like a wave constantly rising and falling from .9v-.1v. test at 2500 rpm as well as at idle on a hot engine.if the oxygen sensor doesnt rise and fall, add fuel(spray small amount of carb spray) into carb while at idle or high rpm and the oxyen sensor should go full rich(approx .8-1v) that is point 8(.8v) not eight volts. you will usually see a reading of .9v . if the oxygen sensor doesnt put out a rich reading than its no good. on the other end you can remove a vacuum line(brake booster hose, half way removed as to not stall the engine) the oxygen sensor should go lean which means around .1 volts. if the oxygen sensor does not respond correctly replace it. beyond that, the engine first and foremost has to run on all cylinders to run clean and efficient. if it has a missfire or dead hole that will cause high HC along with high CO as unburnt fuel is going out the tail pipe. i could go on and on about possibilities but figured i would give you a couple basics to go on. Good luck.

Aug 12, 2012 | Chevrolet Chevy Cars & Trucks

1 Answer

1996 Honda Accord Running lean after changing tune up and new oxygen sensors.


My first thought was fuel pressure. Low fuel pressure would cause the engine to go lean but not set a code for the actual problem.
Is it possible the fuel filter is clogged ? Have you checked fuel pressure?

Jun 28, 2012 | 1996 Honda Accord

1 Answer

1994 ford f150 oxygen sensor location


An Oxygen Sensor (O 2 S) or heated Oxygen Sensor (HO 2 S) is used on all engines. The sensor is mounted in the right side exhaust manifold on some V8 engines, while other V8 engines use a sensor in both right and left manifolds.

Heated oxygen sensors are located in the exhaust pipes below the exhaust manifolds. The sensors react with the oxygen in the exhaust gasses and generates a voltage based on this reaction. A low voltage indicates too much oxygen or a lean condition. Where as a high voltage indicates not enough oxygen or a rich condition.

Disconnect the Oxygen Sensor (O 2 S). Measure resistance between PWR and GND (heater) terminals of the sensor. If the reading is about 6 ohms at 68°F (20°C). the sensor's heater element is okay.

Hope this helps (remember to rating this free answer).

Oct 13, 2011 | 1994 Ford F150 Styleside Supercab

1 Answer

Engine codes are 12, 51,21,53,55 can someone tell me what these codes are. engine is running extremely rich.


12 is battery has been disconnected recently, or went dead.
51 is Oxygen sensor stuck on lean mixture reading
21- no change in oxygen sensor reading
53- internal problem with logic module
55- is end of message/codes.

51 & 21, basically telling you same thing, but I wouldn't jump at changing oxygen sensor first, as a bad M.A.P. sensor can cause a rich mixture, thus oxygen sensor switches to lean to try and compensate. Personally, I'd go with map sensor first, check connections and vacuum lines if all good, replace it, then I'd go to oxygen sensor .

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It is screwed into the exhaust pipe,closer to the converter,than the engine. Will be at least two. One maybe screwed into the converter. Need to know which one,your shop thought was bad.

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96 Buick Roadmaster running lean.


That is an oxygen sensor, these sensors send a signal to the computor to adjust the rich/lean fuel mixture.
When a code comes up for them, they generally need replacing.

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Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust).

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I have a dianogstic machine and the code you were given indicates that the system is too lean. (Bank 1) Were you go from here i'm not too sure. Steve

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