Question about 2003 Ford Ranger Regular Cab

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O2 oxygen Sensor extender - Does it work???

Can anyone tell me if there is any harm in useing an O2 sensor extender?? A device that backs up the O2 sensor and takes it out of the direct flow of the exhust. Used to trick the computer into mixing more air with gas, thus giveing better mpg and more hp.

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You will cause your engine to get hotter because you will force it to run lean. this is not a good situation to put your car in if it is to good to be true it is. This can cause you to warp you heads and burn holes in the pistons

Posted on Jan 17, 2009

  • Anthony baca
    Anthony baca Mar 26, 2015

    I have run the o2 sensor addaptors I used plug foulers it works going on 2 years don't get upset u met have to reset it a couple of times for the computer to understand it stays in there memory have to drill the inside of fouler to size of 02 to fit the hardest part is taking 02 sensors out u needed to run the vehicle always remember safety first block, jack stands the whole enchilada please any ? Ask me



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I am getting 13 miles per gallon. what is wrong?

Your O2 sensor (or oxygen sensor) is located on your exhaust system. One placed before your coverter to measure the efficiency of the combustion in your engine by measuring the amount of oxygen left in the exhaust stream. The second O2 sensor is placed after the converter and its job is to measure the effiecency of the converter in filtering out harmful gases in the exhaust by compairing its reading to the sensor paced before the converter. If your O2 sensor has failed it will tell the car's computer that it is running too lean (more air than fuel) by default. Since the computer thinks the car is running lean, it now is adding more fuel to the mixture to try and compensate for the lean condition and will always have a check engine light on. If there is no check engine light on then it probably is not a faulty O2 sensor. Have a qualified technician run a fuel consumption test and go from there.

Apr 17, 2013 | 2002 Honda Odyssey

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E350 5.4 oxygen sensor not reading on one bank

most dealers do not read fault codes just to make money
have the fault codes read and that will determine which exhaust sensors are faulty ( heated oxygen sensor in the exhaust manifold) or o2 ( oxygen sensor after the cat converter)
the reading will also show it there is a problem ECM

Oct 27, 2017 | Cars & Trucks

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96 Toyota Camry OBD Code P0420 Help!?

You may have a worn out catalytic converter That is what this code indicates.

May 22, 2012 | Toyota Cars & Trucks

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I have research around and found that the Bank 1 sensor 3 O2 sensor is post Cat. But when I got under there I dont see anything that could resemble a sensor. Where is it. Please help. Marc

try this
ALLDATA Editor's Note: Always verify #1 cylinder location prior to diagnosis and repair.

- Cylinder bank number one is the bank that contains number one cylinder.

See: Firing Order

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Cylinder #1 on left side.

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Cylinder #1 on right side.

- The first oxygen sensor in cylinder bank # 1 is numbered O2 Sensor 1/1.
- The second oxygen sensor in cylinder bank # 1 is numbered O2 Sensor 1/2.
- A third oxygen sensor in cylinder bank # 1 would be numbered O2 Sensor 1/3.
- The first oxygen sensor in cylinder bank # 2 is numbered O2 Sensor 2/1.
- The second oxygen sensor in cylinder bank # 2 is numbered O2 Sensor 1/1.

- If a V-6 or V-8 vehicle only uses one downstream Heated Oxygen Sensor (HO2S) it is numbered O2 Sensor 1/2, even if it uses two upstream HO2S.
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Jun 03, 2011 | 2001 Dodge Stratus

1 Answer

What is p1148

P1148 - Closed Loop Control Function Bank 1
This mean that the closed loop control function for bank 1 does not operate even when vehicle is driving in the specified condition.

The Powertrain Control Module (PCM) or Electronic Control Module(ECM) monitor the function of the Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor by comparing the signal with the Rear O2 sensor.

- Engine Light ON (or Service Engine Soon Warning Light)

Possible causes:
- Harness or connectors Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor 1 circuit is open or shorted.
- Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor bank 1
- Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor bank 1 heater

Possible solution:
- Repair harness or connector. If repair is needed
- Replaced Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor bank 1

Then, possible causes are faulty harness or connectors to the air fuel ratio sensor, a faulty air fuel ratio sensor (1) or faulty air fuel ratio sensor (1) heater. Most likely yes it is just faulty sensor. Just replace this devices and reset the stored codes.

Keep us updated.

Feb 10, 2011 | 2005 Nissan Altima

3 Answers

Where are the o2 sensors located on a 2004 jeep grand cherokee and what are they called?

Grand Cherokee oxygen sensor locations for 4.0 and 4.7 engines...



An O2 sensor is a galvanic battery that provides the PCM with a voltage signal (0-1 volt) inversely proportional to the amount of oxygen in the exhaust. In other words, if the oxygen content is low, the voltage output is high; if the oxygen content is high the output voltage is low. The PCM uses this information to adjust injector pulse-width to achieve the 14.7-to-1 air/fuel ratio necessary for proper engine operation and to control emissions.

The O2 sensor must have a source of oxygen from outside of the exhaust stream for comparison. Current O2 sensors receive their fresh oxygen (outside air) supply through the O2 sensor case housing.

Four wires (circuits) are used on each O2 sensor:
* 12-volt feed circuit for the sensor heating element
* Ground circuit for the heater element
* Low-noise sensor return circuit to the PCM
* Input circuit from the sensor back to the PCM to detect sensor operation

Hope helps (remember to rate and commene this)..

Feb 04, 2011 | 2004 Jeep Grand Cherokee

2 Answers

Broker wire to my O2 sensor

Try to trace the white wire that leads to the o2 sensor by unwrapping the harness that is in the vicinity of the o2 sensor. Try to fiind the wire that way. That's the way an electrical shop would do it. Resplice the wires together. You've done most of the hard work. Good luck to you. Tprev.gif next.gif --- Oxygen (O2) Sensor OPERATION All Fuel Systems Fig. 1: A standard oxygen (O2) sensor, as shown, is used in all fuel injection system covered in this manual 86734gb4.gif
Fig. 2: On non-turbocharged engines, the oxygen sensor (arrow) is mounted in the exhaust manifold 86734p07.jpg
The oxygen (O2) sensor is a device which produces an electrical voltage when exposed to the oxygen present in the exhaust gases. The sensor is mounted in the exhaust manifold or turbocharger outlet and is electrically heated internally for faster switching when the engine is running. When there is a large amount of oxygen present (lean mixture), the sensor produces a low voltage. When there is a lesser amount present (rich mixture) it produces a higher voltage. By monitoring the oxygen content and converting it to electrical voltage, the sensor acts as a rich-lean switch. The voltage is transmitted to the engine controller which changes the fuel injector's pulse width. The injector changes the mixture.

Jul 05, 2010 | 1990 Dodge Shadow

1 Answer

Need to replace 2001 Mazda Protege Oxygen Sensor before the catalytic converter... Not sure how to do this or even where it's located. Can anyone tell me how (and where)? Please be as detailed as possible...

The front O2 sensor is located at the bottom of the heat shield just before you get to the exhaust. It has a wire connected to it. You will have access to this from the top of the car.You may need a O2 sensor tool that you can borrow from most major auto parts retailer. Disconnect the battery first then unplug the sensor. Using the O2 socket remove the sensor. The sensor should come with a packet of anti seize, apply it to the threads and install it. Plug the sensor back up and connect the battery and you should be done. Good luck.

Nov 01, 2009 | 2001 Mazda Protege

1 Answer

Check engine light was on. OBD II scan said both pre-Cat 02 sensors running lean. Also shows P0000 code which is a undefined code. S dash light comes every few days then transmission will stay stuck in 4th...

The pre cat sensors running lean does not mean they need to be replaced. They are are detecting a symptom. You need to know why.

If you are using a basic scantool (code only) you need to look up the P0000 code.
I thought this an odd code. I looked it up in my Autotap unit and it does not exist. The lowest # P (powertrain) code I have listed is P0016.

A regular scan tool, won't scan transmission or body codes, mu Auto tap doesn't either. You need a Tech 2 from the dealer for transmission codes.

First some history. The first O2 sensor was introduced in 1976 on a Volvo. California vehicles got them next in 1980, then federal emission laws made O2 sensors virtually mandatory on all cars and light trucks built since 1981. And now that OBD-II regulations are here (1996 and newer vehicles), most vehicles now have multiple O2 sensors, some as many as four!
The O2 sensor is mounted in the exhaust manifold to monitor how much unburned oxygen is in the exhaust. The signal from the O2 sensor tells the computer if the fuel mixture is burning rich (less oxygen) or lean (more oxygen).
A lot of factors affect the richness or leanness of the fuel mixture, including air temperature, engine coolant temperature, barometric pressure, throttle position, air flow and engine load. Other sensors monitor these factors too, but the O2 sensor is the master monitor for what's happening with the fuel mixture. Problems with the O2 sensor can throw the whole system out of whack.
The computer uses the oxygen sensor's input to fine tune the fuel mixture for the best balance of power, economy and emissions. The engineering term for this type of operation is "closed loop" because the computer is using the O2 sensor's input to adjust the fuel mixture. The result is a constant flip-flop back and forth from rich to lean which helps the catalytic converter operate at its best and keeps the average fuel mixture in proper balance to minimize emissions. It's a complicated setup but it works.
If no signal is received from the O2 sensor, like when a cold engine is first started (more on that in a minute) or the 02 sensor fails, the computer orders a steady, rich fuel mixture. This is referred to as "open loop" operation because no input is used from the O2 sensor to fine tune the fuel mixture. If the engine fails to go into closed loop when the O2 sensor reaches operating temperature, or drops out of closed loop because the O2 sensor's signal is lost, the engine will run too rich causing an increase in fuel consumption and emissions. As you might have guessed, that will set a code and turn on your check engine light.
How does it work? The O2 sensor produces a voltage once it gets hot. The sensor compares how much oxygen is in the exhaust to the oxygen in outside air. The greater the difference, the higher the voltage reading.
If you ever replace an O2 sensor (and if you're a DIY'er this is something you will do eventually), its important to remember that the O2 sensor needs to "breath" outside air to work. So don't put any grease on the sensor because it could block this air flow.
An oxygen sensor will typically generate up to about 0.9 volts when the fuel mixture is rich and there is little unburned oxygen left in the exhaust. When the mixture is lean, the sensor's output voltage will drop down to about 0.1 volts. When the air/fuel mixture is balanced or at the equilibrium point of about 14.7 to 1, the sensor will read around 0.45 volts.
When the computer reads a rich signal from the O2 sensor it leans the fuel mixture to reduce the sensor's reading. When the O2 sensor reading goes lean the computer reverses again making the fuel mixture go rich. This constant flip-flopping back and forth of the fuel mixture occurs anywhere from 2 to 7 times a second at 2500 rpm on OBDII vehicles, depending on what type of fuel injection system they have.
The oxygen sensor must be hot (about 600 degrees or higher) before it will start to generate a voltage signal. Many oxygen sensors have a small heating element inside to help them reach operating temperature more quickly.
Ok – that was a lot of info on what they do and how they work. The next thing to know is that trouble codes relating to O2 sensors are very common. But you really need investigate further before replacing an O2 sensor just because you got that trouble code. Armed with the information above on how often the O2 sensor "flips" back and forth and AutoTap or another scantool that allows you to monitor O2 sensor voltage, you can be certain whether the O2 sensor itself is really the problem. These sensors can be pricey, so don't just replace them the first time you see that trouble code!

The O2 sensors are expensive, diagnose what really is going on.

Jul 27, 2009 | 1999 Cadillac Catera

1 Answer

Check engine light is on

A code P0420 is a generic code for catalyst inefficiency. It means the computer is comparing the pre cat O2 sensor value with the post cat O2 sensor value. If they are doing the same thing, it means the cat is inoperative.
Here's how it works in a nutshell. The pre cat O2 sensor tells the computer to regulate fuel delivery at an air / fuel ratio of 14.7 :1 so if you measured it's output, it would be toggling back and forth across 0.5 volts trying to maintain this. This is not for maximum power or efficiency. This is strictly to allow the cat to operate in it's best range. This is actually a lean running engine, but the cat needs a little oxygen to catalyze the remaining harmful emissions. When this small amount of oxygen enters the cat, it is supposed to react with the catalyst and emissions and burn completely, hence no oxygen exiting the cat. Since all an oxygen sensor "sees" is oxygen, it is not suppose see any coming out of the cat. Basically, when an O2 sensor sees oxygen it should have an output voltage below .5 volts (really about .1V) When it sees oxygen it should be over .5V, typically about.9V Sooo....the computer wants to see something over .5V all the time if the vehicle is warmed up. Now if you happen to have a cat that is degrading and it can't catalyze completely, some oxygen will exit the cat and drive this voltage down and set a code. Here's the rub, if the engine or the state of tune has degraded, then the cat will have more **** and corruption to deal with than it was designed to handle. So some oxygen will sneak past and set the code as well.
The moral of the story, the engine must be in a perfect state of tune before diagnosing a bad cat. Ignition related parts are always suspect, the aforementioned O2 sensors in the clarification request were likely replaced unnecessarily as they were just doing their job.

Sorry, it was a big nutshell.

Mar 17, 2009 | 1999 Acura TL

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