o2 senser
 

hello there! i have a 2001 f-250sd 5.4l 4x4. I just replaced the ecc, and i still have the same problem! bank 2 senser 1 doesnt exist! this truck doesnt have senser 2's and it only shows 1 up stream senser! i switched the sensers from one side to the other! still doesnt show bank 2 senser 1! Can anyone help?

Did you have a dealer flash the new EEC to your vin#?

No! i just installed it today! it was doing the same thing before I changed it! its not showing any codes!it the mass air readings are fine and the bank 1 senser 1 readings are fine,

You say the truck has both banks upstream sensors . The scanner only lists one ? Try another scanner . 01 Ford v8 ? It should have post cat sensors installed also . No codes , only showing one sensor ? No run issues or CEL ? Scanner problem . I may be reading your post wrong . But IDK , give me some feed back .

your reading it correctly!it runs a little sluggish from time to time! i did have a bad thermostat & mass air senser! I replaced the thermostat and cleaned the senser, it made a differance, but i didnt get my fuel mileage back! omly gettimg 10 mpg! should be 15-17

If you have replaced ecm ,and have no codes , and scan tool only shows one 02 sensor :-huh . You need to try another scan tool . Am I mistaken ? Your truck does have 2 upstream o2 sensors and 2 post cat ?:-X15 If so you can have a scanner issue . I have 5 scan tools . OTC , Launch , MATCO , Snap On . Mac . I have several readers . Some will not work properly on some makes . ( mostly Asian ) But I have had to switch scanners to get proper info .:'( It can drive you nuts sometimes !:-drink

it DOES NOT have down stream o2 sensers! I have talked about that with other people, its something ford changed for a couple years! I just talked to my buddy! he has been working on this issue also! supposedly the system is designed foe the o2 sensors to be tied together some how! so i ges nothing is wrong with it!! leave it to ford!!

Strange to me , is it a super duty ? I know emissions were different in some cases for " work " trucks . I know some had less strict emission standards than passenger cars and trucks . That is all I got , sorry .

One more thing , cleaning the MAF does not always work . You may have to replace . MAF reading should = engine displacement at idle . 5.4 engine should show 5.4 - 6.4 Grams Per Second at idle operating temp . WOT should show almost , if not over , 200 GPS , depending on temp and elevation . There is a formula to calculate MAF vs CID . Volumetric efficency ect . If only issue is mileage and sluggishness , ck MAF sensor readings .

its a 2001 f-250sd xlt 4x4 crew cab w/ 5 speed manual trans

so have a k&n cold air intake on it!i was just told recently about getting too much oil on the filter! that was the problem with the snser! i will try cleaning it aain!hank for the help! I will keep you posted

Ditch the oil bath filter . K&N is a good filter , if you leave out the oil . The oil will kill the MAF . I just took out 15 in a fleet of used crown vics .,recently purchased by a company .All but 3 needed new MAF sensors . The filters were over oiled . Ck MAF GPS readings to be sure .

if im not mistaken? the maf reading i was getting was like .54??? is the decimal in the wrong place?? and what is wot? i will check maf readings again tommarow

WOT = wide open throttle . Mass air flow , in grams per second , should = engine displacement ( at least ) at idle . An engine with 5.4 ltr. displacement should show 5.4 grams per second at idle , no load . A bit more or a small amount under fluctuating is not an issue . Anything - 1 gram needs to be looked at . Over is not much worry unless over 2-3 grams high ,no load. Ac , defrost , electric load .