ok well i got a 2 wheel drive ranger with the 2.5 motor and lately it has started to lose all its power and the motor i just put in a while ago always ran fine a few weeks ago the check engine light came on so i took it to auto zone to hook up the computer to it and it came up with lean on bank one which i believe is to do with the o2 ok so its still runs ok couldn't afford to buy a new one so i drove it and it started to get its power back so i dint worry about it which was problly stupid but today it started running like **** again so i took it back and it come up with the same code and the mass air flow code so i bought a new one of thoses. ran good for about 30 min then the check engine light came back on so i dont know and i put a different o2 in it the upper one so i dont know if it wasa also bad are if i need to replace the bottom one as well and i also took the my old throttle body off my old motor and put on this new one thinking that might have something to do with it but i wanted to see what everyone else says i was fixin to change out the fuel injecters with the old ones off my old motor since i know they are still good cause the ranger used to run 100 which aint to fast but im lucky if i break 55 now so i know something is messed up

 

From my experience with my 02 sensors, it takes some operation time for the bad output of a bad 02 sensor to build in, and probably some time for it to be 'washed out' if you will, by new data.

Pulling the fuse on the PCM memory (check your manual) will clear the historical 02 data and restore you to default values that probably work fine.

If you have the problem again immediately, it's probably not your 02 sensors. If it takes a while to re-occur, the 02 sensor is more likely.

I believe that just resetting the DTC doesn't clear the bad data from the memory, so you probably would have problems again immediately, even if you did replace a bad 02 sensor.

Anyway, short version: Clear the memory by disconnecting the battery or pulling the memory fuse for 20 seconds. See what happens.

If you replaced the right broken part the trouble won't come back in. If you didn't- or you installed it wrong, like I did- you'll get the codes and the power loss back in.

 

ok well hte light went backl off today after work but it still dont have the power it should and a while back i broek a fuel line right behind the filter from the tank aND I REPLAED it with rubber hose and i dont know if that could be causeing the motor to not be gettein enough fuel are what

 

The 02 sensors can cause the truck's computer to cut back on the throttle.

Did you wipe the computer's memory by disconnecting the battery or pulling the memory fuse for 30 seconds?

Also, please take the time to form proper sentences and paragraphs. Your posts are exceedingly hard to read.

 

On an OBD-II vehicle you will NOT wipe out stored codes by pulling the fuse/disconnecting the battery. The computer uses non-volatile memory, unlike the earlier OBD-I vehicles. If you want the codes removed completely you must use a scan tool. Codes do not 'wash out' or get bumped from memory by new codes. They remain in memory until cleared properly.

Lean Condition - Bank 1 is indeed an O2 sensor issue, front sensor. Replace it. THEN get the code cleared at AZ by the scan tool.

 

thank you Dad's truck that all i need to know. the light went off today and ran good after the new top 02 sensor but on the way home it came back on but i dint notice a lack in the power but i dont know what it is gonna go to the auto zone tom and get them to read it again and clear it for me and see what happens then. and once again thank you and for the other guy this aint no high school class if u cant read it im sorry but aint never had any other problems and if u cant read it them i problly dont need your help so if u could take your time and kiss my ***

 

DT,
I pulled the fuse several times in my 2002 Ranger to clear loss of power & misfires caused by a bad 02 sensor.

The truck ran perfectly for an hour or so and then the symptoms started repeating and the CEL came back on.

I don't have the wiring diagram or specs, but it sure seems like it's got volatile memory that can be wiped.

Do you have an alternate explanation as to why pulling the fuse cleared the CEL and made my truck run great for an hour or so?

I have a computer program to read trouble codes, and they definately cleared with the fuse pull.

 

You must be still in high school to think that the way you present yourself is only relevant in high school.

Besides, your life would be easier if you were literate.

 

Jay, your posts read like crap. No offense, but learn the proper construct of sentences and use of punctuation. You'll be severely limited in life if you don't.

You'll clear current codes, but NOT stored codes. OBD-II mandated use of non-volatile memory to help keep people from beating emissions testing by doing exactly what you're attempting to do - pulling power from the computer to clear chronic CEL issues.

Check it with a scan tool and you'll see that the past (stored) codes are still in memory. Don't believe me? Take it to the local smog test station and have them check the codes.

 

heres the deal.................1996 and newer.. Forget the phrase "clear code". IF you fixed the problem, the light will turn out once it has run its 3( or whatever it calls for) good trips with a proper repair. the check engine light means nothing, leave it on till it turns itself off, then you will know it is repaired

 

BTW, lean codes are not caused by bad sensors. A lean code like yours is an indication of either an intake or exhaust leak, or a fuel delivery problem such as plugged fuel filter or a dying fuel pump.

 

if a tps or mass airflow are malfunctioning you can get lean codes

 

ok well i been working on it askin around and turns out i had a bad coil and the number 2 spark plug was not working. well i replaced that and it ran alil better and i cleared the codes out with the scanner tonight and drove it home from town and the light has not come back on but i had a random misfire code which im sure of it was the coil and the lean code. i replaced the mass airflow and i aint replace the tps yet i was told cause it dont idel right it goes up and down so i think the idel air control might be sticking so im buying a new one of those tom to see if that helps and thanks everyone