If you are asking where the O2 sensors are located on your exhaust system, just follow the exhaust pipe along its length. You'll find both of them somewhere along the pipe. They measure the efficiency of the catalytic converter, nothing to do with the muffler.
Upstream is on the inlet end of the catalytic converter that is toward the engine. This may be immediately before the catalytic converter or closer to the exhaust manifold. This is sensor #1.
Downstream is on the outlet end of the catalytic converter that is connected to the muffler. This is sensor #2.
Get a 2nd opinion on the evap canister especially if someone says you need one and they didn't get an OBDII code.. An OBDII tester should post a code if there's a problem with the evap system.
Hi the issue here is about emmissions and new laws. the first box inthe chain is the catalytic converter which is supposed to burn off al the worst of the toxic gases this has oxygen sensors fitted so the engine management system gets some details of how wel the engine is burning the fuel. the others down the chain of te exhaust also monitor the gas flow and give back details on how to adjust the injector samples.
the technicallity is all part of giving you the motorist the most economical MPG. so yes they serve a very good purpose. yes i know what you where asking rick hence my answer. the engine management system does it's best however as the car gets to be as old as yours is it may need a new cataylitic converter before too much longer as the do clogg up hence the issues you have been having.
You want to tell us the codes or keep playing guessing games? You didn't even say if it was a 4 or 6 cylinder motor. Even when you get the codes you still need to monitor the voltages and switching times to verify it really was a bad 02 sensor that is causing your run-ability problem. Upstream means before the converter (between the motor and converter. Downstream means after the converter.
Next time please post the OBDII codes for us. I have had good luck with Ford OBDII codes pointing out the faulty oxygen sensor. Some people try cleaning the O2 sensors but if I'm going to the trouble of removing the sensor, I'm going to install a new part.
Sensor 1 is upstream ahead of the catalytic converter. Sensor 2 is downstream AFTER the catalytic convter
the O2 sessors are not by the muffler they are neer the catalitic converter. bank 1 sensor 2 sounds like the downstreem O2 sensor but if one is bad and you have the money I would just replace them all. The evap will have little to do with performance that is most likley your O2 issue. Evap has to do purely with MPG
COULD IT BE A GROUP THING ?
For correct sensor part number and location, you must read and record your calibration.
Contact Ford parts. provide your vehicle info.
They can tell you the sensors and locations your vehicle was equipped with.
Terminology can be corrected that way.
Confusion can be erraticated and your correct answer
can be known in a few minutes.
Their part will be the current attempt by the engineer to perform the task when you use the fuel that is available for sale to you, and you provide the correct diagnosis.
A technician is supposed to be able to help, but even he must question current parts and TSB as well as possible emission recall info.
It has to be this way because this information has to be kept updated. The dealer pays people to keep it correct, updated, and available.
You could also correct them if a TSB or recall is more current and correct, and it applies to your vehicle and diagnosis.
The aftermarket has these scanners available to point you to the parts in question, the pin point test helps decide if the part is a failed part or not.
Often, these sensors MUST be replaced in a group because of potential repeat repairs, and the (causal condition) occurring.
So, dont hate the truck, question the diagnosis and the available fuel, then question and obtain the most current info, please.
Mr. Rick, your posting is not about oxygen sensors it is about psychology. It is about psychology for you, a recently qualified driver and now operator of a truck, based on cultural American male teenager values, are in need of a qualified and experienced mechanic. Yet, in our culture, a person with a vehicle transforms into a "pseudo mechanic" due to absence of experience and money. The transformation leads people, like you, enhanced by what I name mechanophobia, to made expensive guessing as to vehicles, to purchase parts that will not be the repairs needed and, eventually, failure. Machines such as code scanners are one of the tools that trained, certified and experienced mechanics use to determine what is wrong with a vehicle. You are, and only you know how long you have done this, being paying huge amounts of money for gasoline. IF you had taken this vehicle to a mechanic at the first sign of trouble, that wasted gasoline and the ensuring pollution could have been avoided. That is the first wasted money as to this issue. Next is the code located. Now you wish to "fix" this car that now may have more issues due to the nature of the improperly unburned fuel, than originally. Time and time again, people like you ask here for "help" which means "guesses." Time and time again these guesses fail. Time and time again more money is wasted. Your vehicle, your money, your choice. But at sixteen years of age, untrained in auto mechanics, with a rather old vehicle but still a highly complex machine ( I have a 2001 vehicle so I know) that cannot be guessed as to repairs, you are not being wise nor smart as to repairs. Five $20 items may seem cheaper than one $100 item. But they are not. $100 is still $100 no matter how it is divided. My best advise is to leave auto repairs to the experts. Ultimately, it is the cheapest and most wise of the choices.
I would just replace both. When one goes, it usually means the other is going to go soon. Also, just a bit of advice: Never start the engine with the oxygen sensors removed. If you do, the check engine light may come on and stay on until you bring the vehicle to a Ford dealer to have it reset.
DONT BOTHER WITH IT JUST YET! The reason for most O2 sensor issues is a dirty CONTROL VALVE! A new one will also act up if the IAC valve is dirty inside it! It adds more AIR as required from the signals given off by the 02 sensor itself! run GUMOUT through the IAC valve FIRST and then see what happens!
I have a 2002 Ford Ranger XLT extra cab v6. I'm looking for the oxygen sensor that is infront of the muffler and the one infront of it. I know how it says on some check engine scanners something like 'bank 1 sensor 2' but when I Check auto parts stores it just says upstream or downstream. which one should I get? Also I noticed the mpg and acceleration is low ( when I go from a stop it feels like I'm pulling a trailer And I need to get gas 2 or 3 times a week) I was told I need to have the evap canister replaced. Is that problem and the evap canister related? Please don't post "google it", if that was an Answer, Y! Would not have this page and Thank You.
If a code is set for a O2 sensor it should be replaced. The upstream sensor is in FRONT of the catalytic converter, the downstream sensor is AFTER the converter.
A down stream oxygen sensor is the one *after the catalytic converter.
Sorry this may be slightly off topic, but i wanted to let you know that for the last couple weeks i have been making $300/day just by cheating at online roulette.
The method is so simple i just read this tutorial (check sources)
Put (1) gallon of lacquer thinner in your tank at 1/2 empty, run it down to empty. That will clean the sensors and cat.
(for after cat only!!!) install a spark plug non-fouler on the end of the O2 sensor and then install in pipe - never get a light again - if you do get a light, take it out and plug the hole in the non-fouler with red high temp RTV.
Oops I ment to say the one behind it and the one infront of the muffler.
Yea
You pooted. And Jews occasionally ruin their pants. But not real often. Not as often as the *******.
Mark is correct
yes
I don't know
try to pt it in
itll work
yea ok
what?
idk
