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.
Dan B2014-10-06T18:57:16Z
If you have an inline engine, you only have bank #1. V4, V6 & V8 engines usually (but not always) have Bank #1 (left side, driver's side) and bank #2 (passenger side) of the exhaust system. It's also possible that V engines will have a single exhaust, therefore, only a single upstream and downstream O2 sensor. Whether you have a single exhaust or dual exhaust, the upstream sensor will be the same part number regardless if it is bank 1 or bank 2. Same for the downstream sensors (different part #, but the same part # for both banks).
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.
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.
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.
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.