Question about 1992 Ford Tempo

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Oxygen sensors causing misfire? where can i get diagrams to show locations

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  • Jeffrey Turcotte
    Jeffrey Turcotte Nov 14, 2010

    oxygen sensors do not cause misfire. are you getting P03xx trouble codes? Please see my tip athttp://www.fixya.com/cars/r6715318-cause... . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

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Not likely. Only on newer vehicles that use what they call Air/Fuel ratio sensors have I seen this happen and cause misfire....not Fords though. How many miles? they have a lot of bulletins for wire harness issues. I know of one for the mass air flow sensor that can cause misfire symptoms. Is the miss consistant? all the time? worse cold than hot? Maybe you need a tune up (plugs, wires, fuel filter)....maybe an ignition coil. Need a little more info

Posted on Nov 14, 2010

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1 Answer

ENGINE LIGHT ON CODES P0141 & P0144


code p 0141 refers to heated oxygen sensor (HO2S) 2 bank 1--heater control--circuit malfunction===causes --wiring---HO2S--- ECM
code p 0144 refers to heated oxygen sensor(HO2S) 3 bank 1--high voltage ===causes wiring short to positive ---HO2S---ECM
also refers to oxygen sensor(O2S) 3 bank 1--high voltage ===causes wiring short to positive---O2S-- ECM
HO2S sensors are the units in the exhaust manifolds or before the cat converters
O2 sensors are after the cat converter
two completely different operations
use the special tool for sensors as the wires are easily damaged from the wrong tool use
as for misfiring you will get a P0300 (0300,0301,0302,0303 etc) depending on which cylinders are misfiring
when checking for misfiring the injectors , (blocked or not firing) are as important as plugs and wires
If the misfiring continues after sensor replacement , replace the ECM with a known good one as it is common to all fault codes and misfiring

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The ignition coil is causing the misfire. That is causing rich mixture which could case the oxygen sensor issue. You need to work from the ignition issue to the sensor. The reason is if you replace the cat and the engine is running rich it will heat the cat up to the point that the car might catch fire. Oxygen sensors are also prone to fail after about 60 thousand miles.

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There is a common misconception that a CODE READ and a DIAGNOSTIC TEST are one and the same.. They are most certainly NOT!
The first thing to have done is to verify that the engine has a misfire or not. Then if the misfire is present, determine what is the cause of the misfire. A misfire in and of itself will not cause n oxygen sensor to "burn out". However if the oxygen sensor is bad, it will cause a performance problem and also cause an idle issue. What needs to be done is to connect the vehicle to a scanner and observe the data when the problem is happening. That way you can know what the fuel mixture is and whether of not the oxygen sensors are working properly.
Unfortunately, there is a lot more to engine performance diagnostics than just a code reading.

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I have a 1997 Bravada that has a bad oxygen censor and a bad caytalytic converter. Would both of these problems cause a misfire, and , wich sensor is in bank 2


Yes they can surely cause an misfire.

I cannot understand your statement "wich sensor is in bank 2"

If i am not wrong you are asking which sensor is present in bank 2 .

The 4th O2 sensor is located in bank 2

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Where is bank 1 sensor 2 on f150 4.6 Eng. .


Diagram: Ford Explorer and V8 O2 (Oxygen) Sensor Locations

Ford Explorer and V8 O2 Sensor Locations diagram. This shows the location of Ford oxygen sensors on Bank 1 and Bank 2. If you want to know where your O2 sensors are, this diagram is your guide.

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Hope helps.

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Misfiring on cylinder 2+3,replaced oxygen sensor before cat and machine print out still shows oxygen sensor and is still misfiring.


First,call a shop or dealer to make sure the proper plug is on the proper coil location,unless you are POSITIVE that they have not been messed with recently.Then Check the spark plug wires.Also,push down on the plug wires and trace them back to where they originate(coil pack),and push down on them to ensure tight fit.If it's still bad,check the plug wires.Remove them from the plugs and make sure they are not broken.If it is a 4 cylinder,the coil pack may operate those 2 cylinders on one side and 1+4 on the other.If you do anything such as replacing the coil pack,make diagrams of the wire's traced out locations from spark plugs to coils.If you get one wrong,it will be worse.If the plugs have never been changed yet,it may simply be that they have fouled.Greg

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Idling #5 and #7 miss fire. holding it at 2000 rpms makes all 8 miss fire. its running really rich and the only code its showing is P0300 which is engine miss fire. have replaced plugs wires cap and...


When there is an engine misfire it could be gas or spark related. Or, the oxygen sensor may not be operating correctly, which controls fuel supply.

If there is a 'random misfire' then it could be an oxygen sensor causing the problem, as well, causing a rich mixture.

Good luck on this repair.

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  1. P0171: This means that the oxygen sensor has detected a lean air-fuel ratio. This can be caused due to a vaccuum leak or a problem in the HO2S circuit or the HO2S (Heated Oxygen Sensor) itself. (Bank one Sensor one). This is commonly located along the exhaust pipe. It could also be a bad Mass Air Flow sensor or a bad Engine Coolant Temperature sensor. Diagnostic checks will be needed to be carried out to be verified though
  2. Well as for the other codes, it means #3&4 cylinders are misfiring. It is a possibility that the P0171 code mite have caused the others to show up. I can be wrong though. But it is a strong possibility. If the air fuel mixtue is too lean indeed, mis-firing will occur, unless it is an actual electronic and not a mechnical problem. By the way, when these codes appear, how is the engine's performance. Does it remain the same or behaves poorly?

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Diagrams


your oxygen sensor or sensors are located on your exhaust pipe just after your exhaust manifold

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