Question about Ford F-150

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I have a 1994 Ford F-150 with a 5.0.. I have codes tell me to change the oxygen sensor. So I did. has the same problem we have the engine running funny. started up go down the road its fine.. then the check engine light comes only to start not missing but running rough, sputtering. I can let off the gas and stomp on it it'll clear up and quit.. then it repeats ever so often. Same codes keep coming up nothing different.. what's my problem are there 2- o2 sensors??

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David, there should be 4 oxygen sensors for this truck, one before and after each catalytic converter. The code should tell you which bank is bad.

Posted on Dec 03, 2014

  • David Henderson Dec 03, 2014

    Dont have but 1 catalytic converter


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The ECM isn't getting good readings. Could be the front one or the back. Several things to check. First check all of the vacuum hoses and fittings. Ford has always had problems with the fittings mostly. If they are soft, mushy, or collapsed. replace them. Next would be to check the continuity /resistance of the O2 wires. If they are above 5 ohms resistance, run new wires. Also check for corrosion at the plugs.

Posted on Dec 03, 2014


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SOURCE: Check enging light is on

Engine Light on Troubleshooting code from Auto Zone P0442, I replaced the gas cap and light still stay on?please advise

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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.

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SOURCE: My 1996 Ford F150 4.9l 5spd. rough idle, poor drivability, stall

try replacing the throttle position sensor

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1 Answer

Code 42 ego always rich what is ego

Exhaust Gas Oxygen or otherwise known as the O2 sensor ford used this term up until 1994 when the federal regulations mandated industry standard terms and the implementation of the enhanced computer diagnostic system known as OBDII your O2 sensor is staying above .5v more than it should could be running rich,fouled plugs, plug wires excess fuel or a bad o2 sensor

Dec 07, 2012 | 1988 Ford F 150

2 Answers

97 CV - Chk Eng light on - something about oxygen sensor??? BUT - in cold weather - has little to no PWOWER in accellorating - UNLESS I allow the engine to "warm-up" for a while?>???

if the oxygen sensor is bad it will either not send or send the wrong signal to the ecu making the engine think it is running rich on fuel so the ecu cuts back the fuel supply

Jan 10, 2011 | 1997 Ford Crown Victoria

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 .

Oct 21, 2010 | 1993 Dodge Caravan

1 Answer

I have a F-150 99 with a code of P1131... Is it that sensor off the exhaust manifold the problem?? I also heard you have to have a special tool for this?? It runs great maybe idles a little rough. Does...

The P1131 means that your upstream oxygen sensor (the one closest to the engine) is not switching rich to lean and back as frequently as it should. This could be due to a vacuum leak, a failing oxygen sensor, or a rich fuel mixture.
Rich mixture - Too much fuel, not enough air.
Lean mixture - Too much air not enough fuel.

Jun 29, 2017 | 1999 Ford F150 Regular Cab

1 Answer


hi, you dont have to yell. there are no "jets" to change. get a code reader and check the engine code. it should tell you whats wrong so you can fix it. bad oxygen sensor, bad map sensor, bad mass sensor all these can cause heavy fuel useage.

Aug 10, 2010 | 1994 Volkswagen Golf

1 Answer

How many o2 sensors are on a 1994 econoline with a 7.5 gas

The 7.5L engine's schematic shows one heated Oxygen Sensor and the EEC-IV codes don't refer to more than one bank or more than one Oxygen Sensor code for the 1994 Econoline.

However, if you think this is wrong, you can look on the exhaust manifolds, left and right, and after the catalytic converter, if so equipped.

Aug 09, 2010 | 1994 Ford Econoline

1 Answer

Loss of power, then engine light came on. Now, it barely will stay running, idles very low, and occasionally dies. Any suggestions?

Your best option is to go and have it tested, most parts stores will test it, and many will do it for free. Either you have a real problem and a sensor has detected it, or the sensor has gone bad. Either way, to allow your vehicle to be able to run, your computer has stored the trouble code, and is now operating by assuming that the sensor is in one positions. An example is the oxygen sensor(s), if it goes bad computer notes the code and then opperates assuming that the oxygen sensor is sensing x% oxygen in the exhaust. That sensor normal senses a varying amount of oxygen in the exhaust, if the amount changes, the computer compensates with different gas and air flow, so if the computer is assuming the amount of oxygen isn't changing then it cant adjust the flow of gas and air. But that is just one of many sensors that could affect your vehicles ability to run. That's why it would be best to have your computer run on a diagnostic computer.

Jan 24, 2010 | 2006 Ford F-150

1 Answer

Yes my truck is 1998 ford f 150 4.2 an i have code po174

DTC code p0174 means "System too lean (Bank 1)"

Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exahust). On V6/V8/V10 engines

, Bank 2 is generally the side of the engine that doesn't have cylinder #1.

Jan 09, 2010 | 1999 Ford Windstar

2 Answers

My 2001 Ford Escape runs rough before it warms up. The check engine light has just come on. I assume it is an oxygen sensor. How do I replace it?

Well, fords are known for multiple O2 sensors... so I would have Autozone do a free diagnostic to see if

1. it really is an O2 sensor - and which one
2. eliminate the power feed to the injection/choke circuit.

Oct 14, 2009 | 2001 Ford Escape

1 Answer

Check engine light

P0041 Downstream Oxygen Sensors Swapped From Bank To Bank
How does a P0041 code trigger the check engine light? This code will trigger the light to come on under the following condition:

The Heated Oxygen Sensor Monitor, a strategy built into the computer, determines if the Heated Oxygen Sensor (HO2S) signal response for a change in fuel trim corresponds to the correct engine bank. If a response from the Oxygen Sensor being tested is not indicated, a trouble code will be set and the MIL (Malfunction Indicator Lamp) will illuminate.
Possible Causes:
Crossed Heated Oxygen Sensor harness connectors
Wiring swapped from one Oxygen Sensor connector to the other
Wiring changed at the computer connection or in the related harness

Apr 09, 2009 | 1994 Honda Civic

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