my truck has 66k miles on it, should I replace the O2 sensors on it. I've changed the O2 sensors on my turbo beetle every 50k should I do the same for the truck.

 

Hi.

First - know that you have 4 of these.

Wellsir - the FRONT O2's are Primary sensors. They control A/F's in closed loop, and are crucial to power, emissions and mileage.

The rears are Cat monitors - hence are less crucial.

O2's can fail in as little as 20k (or even less, in extreme cases); it depends on fuel quality, any additive usage (octane boosters, Seafoam crappola, etc). Or, they can last far longer.

The only way to know - other than outright failures that trigger a code - is to directly measure their switchrates. This is easy for a person that has the proper diag equipment ( or a datalogging-capable programmer like SCT sells).

FWIW - I change my fronts no later than @ ~30K-40K miles - and I do track switchrate waveforms - I log when they are fresh and watch them periodically. Yeah, I'm **** - not much else to do when snowbound fer 6 months ( well... there is .... *hint-hint* )

Finally - it's been suggested by a very knowledgeable person on here that OEM are the first-choice replacements, with Bosch being second. OEM gets the nod for optimum responsiveness and accuracy (at a price).

Good luck, sir.


MGD

 

Not until they fail a published test. Read the maintenance booklet with your owner's manual packet.

 

Rob - refer to this post for more info on O2 replacement.

https://www.f150online.com/forums/1356622-post2.html

You can call TP to discuss further if you wish - and it's good advice.

MGD

 

I replace mine at 40k with MC.

http://www.vmptuning.com/forum/showthread.php?t=825

 

Im getting a new set for mine for the spring. Maintenance galore this year

 

Is the DY835 the Ford Motorcraft part number?? If so, Rock Auto has them for $46.99 each. I'm gonna get some for my truck to see if that helps my MPGs. I have 143K and have originals as far as I know---DirtySCREW

 

Are these easily accessible? Thinking about changing mine out.

 

No.

 

Yea, I would swap them out if I were tuning. Justins link shows why. It's allot easy dialing in for the tuner with stable sensors.

BUT, the factory installed O2's (OEM's), should last 100,000 miles easily. I would replace them all at that point, - not just the forwards, for a couple reasons. - Quick switching response / and they can lock in place stripping the bung upon removal, if you neglect them to long. Believe me , I know lol.

 

Since we're talking O2 sensors and what to look for.

I just changed my front O2's last night and did some data collection with the scal2. Like a dumba$$ I didn't think to grab data before the change so I have no reference point. Still a bit pissed at myself for that.

Very weird my #1 bank voltage was bouncing all over gods creation-non stop. From my understanding that's normal.

Now the #2 bank voltage is pretty steady and hovers around .7 volts. Really never bounces-just hovers.

If I give it the onion, I see both voltages move around. Sometimes in the same direction. Sometimes in the opposite direction. IE. bank 1 goes high to low. Bank 2 goes low to high.

When you run the average for the voltages from each bank. Between .5 and .6 when you get rid of some of the outlying data.(under .1 volts)

I'm thinking I have a problem somewhere, cause I would think they should be acting the same. Especially since I reaplced both at the same time with the same part number.

Or am I just freaking cause I'm a freak?

I've got 85k on the orginal O2's, no code, but I do have black soot on my tailpipe, hence the change out. 05 5.4 with efan,ud pulley, airforce 1 3.5" intake, corsa exhaust, and troyer tunes on xcal.

 

Stop beating yourself up and re-install the old ones again. - I mean, how long does it take lol.

That way you something to compare. It's kind off no good without that data to evaluate, as your trying to do.

 

LOL if it's me....and I'm not the smallest guy....and found my hand kinda stuck and cramped trying to do the right side O2.........1 hour. 34 seconds for the left in case you we're wondering.

Maybe I should just grease my whole body down in vasoline.

Any idea which is the #1 bank and #2 bank?

 

- The second time is easier.

Bank #1 = Cylinders 1-4 (Right/Passenger side)
Bank #2 = Cylinders 5-8 (Left/Drivers)

 

Sad but true, my O2 sensors have 146k on them now. they outlasted the 4.6 that was originally in my truck. when I swapped in the 5.4 they were spot on. so I'm still running them. get 21 mpg highway.

I think you'll be fine.

If in doubt, do as already mentioned and have someone, or yourself test them and see how they're reading.