91stang

i just got a test ran on my car and it says it's lean... how hard is it to replace o2 sensors? i can't find anything in my haynes manual

samseed101

What makes you think it's a problem with your O2 sensors?

To answer your question, it will take about 5 minutes max to remove and replace both of them. But I'm curious what the actual problem is.

Just disconnect the wire harness, unscrew the old sensor with a wrenc, put the new one in, reconnect the harness. Repeat for the other side. Done.

TwotoneVert

Easy, I suggest you buy the 5.00 socket with the slot in it to remove them. You dont want to pinch the wires. Be sure and use anit-seize on the threads.

jasonvri

Just unthread them from the exhaust and un-plug from the harness.
Reverse for intallation.

May want to do a little poking around first though, as other things can cause lean conditions.

jason

2 kwik

I would clean them first and retry...it's cheaper......I like to see you guys change my 02's in mine in 5 mins with a tremec 5 speed and a nice big *** sfi skattershield

91stang

i got one of those tests done and it said that it was lean and that the o2's were switching back and forth. plus i have no idea how old they are

91stang

it's either that or my MAF (so the test said) and i that's clean

samseed101

What test do you mean? Did you pull codes, run a wideband O2 sensor, or something else? I'm still a bit confused.

But as others have stated, other things may cause lean conditions. Faulty MAF sensor (how did you clean it? Any chance you damaged the wires or used the wrong cleaning solution?), vacuum leaks, any number of issues with the fuel system, timing...

91stang

yea i pulled codes... i don't have them on me but i can try to get them to you. i actually went to a shop near here that specializes in mustangs and fords and they said it was either the tps, maf, or the o2's.

i cleaned the MAF by getting some brake cleaner and putting it on a towel and wiping it off a bit but it seemed pretty clean. and i supposed to take it all apart

oh and the test said that it was having trouble keeping idle

samseed101

Okay, it's making a little more sense now. Make sure you used the proper product to clean the MAF. Swapping out the O2 sensors is also a good idea. If you're ahving idle problems, it wouldn't hurt to remove the IAC and clean it with somne carb cleaner. That should be easy to remove and replace. You could always check your TPS voltage, but that may not be necessary right away.

Usually if you have bad O2 sensors, you will get a CEL that goes off and on at seemingly random times.