Hey guys! ChrisFix here, and Today I'm gonna show you how to replace an air fuel ratio sensor on a
2003 Toyota Rav4. You can see here
We have a check engine light for code P1 one five five (P1155) , And this code indicates a bank two
sensor one air fuel ratio sensor error.
This is a common problem for Toyota's and Lexus engines typically the heater element in the sensor goes bad
And I'll show you how to test that before you go out buying a new sensor since they can be expensive.
The process will be the same for any Toyota or Lexus with this 2-liter four-cylinder engine
So here's our Exhaust Manifold, Where the new sensor screws into you want to make sure the engine is cool because this gets very hot
And you'll burn yourself. so what you're looking for is bank to sensor one
This is the sensor right here so the first thing we're gonna
Do is test the sensor to make sure the sensor is the actual problem to do that? We'll go right over here
You follow this line you make sure it's for Bank Two Sensor One.
Follow it up press on this tab here, and as you're pressing on this tab you're gonna pull out and
Then you can see on here
There's two black wires on top and then a blue and a white on the bottom
You want to test the two black wires so we have our Ohm meter. I'm gonna set it to 200 ohms
We'll take our sensor here and again you want to go to the two black wires right there,
Which are gonna be the top of this pigtail here
Connect each lead of the multimeter to each black prong in the pigtail you can see there's no continuity so the heater circuit is broken.
Let's compare this to the sensor that works
So here's a brand new sensor
And I'll show you what it should look like the two black wires are on the top right here.
You just touch one prong and touch the other
and you can see there is resistance and
Obviously, this is a good sensor because It's a brand new. Now that we verified the sensors bed. Let's replace it
I just got back from the parts store, and we rented this oxygen sensor socket, and it has a special slot
So you could slide the sensor wire in it you definitely want to use this socket because it'll make the job go smoothly and you
Won't strip the old sensor while you're trying to take it out plus. It'll help for installation of the new sensor
I'll put a link to a good oxygen sensor socket kit in the description. So be careful working on a hot engine
All you're gonna. Do is you're gonna get this,
slide the wire in
Slide that down and get your ratchet on there
Unfortunately this kit fits a 3/8 ratchet, but my breaker bar is a half inch ratchet so what I'll do is
I'll use a cheater bar. Just put a piece of long tubing over your ratchet
And twist
This is really hot once you crack it open. You'll be able to take it off by hand. I have a welders
Glove you can either let this cool off, Or get in there with your welders glove.
Just unscrew this all the way now.
Pull that out.
So here's the new Air Fuel Ratio Sensor
I'll have a link in description to where you can get one cheaper than at the part stores
As always you check to make sure that the sensor is the same and it looks identical has the same length and everything
It comes with this anti-seize, which is good. You're just gonna add a little bit of anti-seize right on the threads
Don't get it on the actual sensor itself
You don't want that, Just on the threads
And that'll make it a lot easier to come off if you ever have to replace these again
You don't need a lot of this stuff, Just
Get it on like that and push it in with your finger
Just get it in the threads and that looks perfect
You do not need a lot of this stuff now. Let's go thread it into the hole and tighten it up
Be careful not to cross thread this make sure it goes in nice and smoothly
Once you get it threaded in
Tighten it up all the way. Get your oxygen sensor socket
And snug it up you don't need to make this super tight you just need to get it real snug.
Good
And then after we tighten this we're going to just connect the clip right in here that
snaps in like so
so we have our new air fuel sensor
Going up clipped in and now let's delete the codes to check engine light and see if it gets triggered again
So we have our bank two sensor one code right here
We're going to delete it
good
Now we'll start the engine
And we'll go for a ride and see if the check engine light comes back on
After the ride you can see the light didn't come back on so we fixed the problem
That's how you check and replace an air fuel ratio sensor
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