DIY : changing the Oxygen / O2 sensor on Yaris hatch MANY PICS

[auxmike]

It's my pleasure. That bottom one was real stuck in and the threads got a bit chewed up. The top one came off with very little effort..

[I_Love_My_Yaris]

Hello

Auxmike, your car is petrol, right ?
I have a diesel, D4D, so the O2 sensor is in the same location ? In my case is only one or two ?

My problem is that my little bug is takeing 10-11 l/100 km......like duble. I tested itt but are no erors. I suspect the O2 sensor to be responsable for this. What do you think ?

Thanks

[auxmike]

I'm not familiar with the diesel since we don't have them in the USA .
I honestly don't know!

[sperginjm]

How did you remove the center console on the yaris to disconnect the down stream o2 sensor

[auxmike]

If memory serves me well you first unscrew the console where the cup holder is at its rear by the handbrake. There's a screw or screws in the bottom of the cup holder well. They may be covered by a felt disc. You remove those. Then you need to lift up/pry that plate that has switches in it so as to let it pass down through the console she'll or you may need to remove the wire harness plug from each switch. Then you just tip up the console a bit from the rear and pull back. There's two pins in the front , so when you pull back they come out of their holes.
I haven't done this since the DIY review and am going from memory only.
Let me know how you make out😇

[Cigar_Maverick]

My "New to me" 2007 Yaris 5 SPD manual Trans hatchback has a check engine light that indicates the O2 sensor needs replaced. The car has 106,000 miles on it. Would it just be good practice to change both the O2 and Fuel/Air sensor? Rock Auto has the DENSO 2344069 Downstream for $58.79 and the DENSO 2349052 UPSTREAM for $84.79. O'Reilly Auto Parts has a tool loaner program that includes the sensor wrench. Provided I heat up the engine, it sounds like a straight forward project. Just need your expert opinions on replacing one or both. I have no idea if the previous owner had replaced either, ever.

[WeeYari]

That's pretty early for an O2 sensor failure. Sorry I have no advice as I've not had the need to tackle the job.

I personally would have made the purchase deal contingent on that issue being taken care of.


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[Cigar_Maverick]

Originally Posted by WeeYari

I personally would have made the purchase deal contingent on that issue being taken care of.

As usual, my hindsight is 20/20

[WeeYari]

Have you cleared the code to make sure it is truly a reoccurring failure?

[Cigar_Maverick]

Originally Posted by WeeYari

Have you cleared the code to make sure it is truly a reoccurring failure?

I have not. I can take it back to the parts store to clear unless there is a way to do it at home?

[WeeYari]

Originally Posted by Cigar_Maverick

unless there is a way to do it at home?

Only with an OBD scan tool.

I usually will do a reset to make sure a cel was not triggered by a hiccup before I spend my cash.

[Cigar_Maverick]

Originally Posted by WeeYari

Only with an OBD scan tool.

I usually will do a reset to make sure a cel was not triggered by a hiccup before I spend my cash.

I'll give it a shot. If I get the error again, I'll replace both.

[WeeYari]

There is also a thread on here somewhere documenting the case of a member with an issue with the one of the O2 sensors. Problem was a broken or mouse chewed wire!

Also, the code will point to the exact sensor (upstream or downstream O2) issuing the fault. I would only replace what the code indicates and not other stuff just for the hell of it. Sensor failures are rare at 106K miles.

[Cigar_Maverick]

Being a new owner to the car and not knowing it's history, I was just going to err on the side of caution and replace the sensors. However, I'll get it reset and drive it a tad more.

[Cigar_Maverick]

Took the car out and warmed up the pipes on the 2007 Yaris. Got the O2 Sensor and Air/Fuel sensors removed pretty easily. Bought DENSO sensors from Rock Auto. The O2 sensor in PN 234-4069. The O2 sensor looks a LITTLE different. Just want to be sure I'm ok to install it in the morning. See the picture below of the old/new O2 sensor:




On an unrelated note, when I took the console out, I saw these unused wires. This car does not have a lot of options, so I was just wondering what these would have been for. Power lock/windows?? see below:






Also, I assume I use all of the lube on the threads that came with each sensor? Can't use TOO much can ya?

THANKS!
Russ

[07liftback]

Originally Posted by Cigar_Maverick

...

On an unrelated note, when I took the console out, I saw these unused wires. This car does not have a lot of options, so I was just wondering what these would have been for. Power lock/windows?? see below:
...

Looks like it's for the power locks. My Yaris came with power locks and the master switch is right next to the hand brake and shifter.

I just did my oxygen sensor and although it seemed impossible to reach from the top at first, it was MUCH easier getting at it from the front rather than crawling under the car. The only reason I got under the Yaris was to spray the PB blaster on it since I couldn't see what I was spraying when hovering above it.

Using a 3/8" drive ratchet and a oxygen sensor socket, I wasn't able to get leverage either above the car or below it so I had to attach a "cheater pipe" on the handle. It's basically a metal pipe from an old bedframe that I place over the ratchet and was able to get superb leverage without kicking or hammering the ratchet. I could probably use this cheater pipe without the PB blaster prep and still do okay.

Anywho, does anyone know if it's absolutely necessary to reset the ecu by unplugging the battery or will the car relearn the readings from the new oxygen sensor? I will continue without resetting the ECU to see when my MPG will finally improve.

[Cigar_Maverick]

Originally Posted by 07liftback

Anywho, does anyone know if it's absolutely necessary to reset the ecu by unplugging the battery or will the car relearn the readings from the new oxygen sensor? I will continue without resetting the ECU to see when my MPG will finally improve.

Honestly, I'm trying to remember if I unhooked the battery or, more likely, went to the local parts store and had them clear the errors. Almost certain I just had the codes cleared. No errors since.

[07liftback]

Originally Posted by Cigar_Maverick

Honestly, I'm trying to remember if I unhooked the battery or, more likely, went to the local parts store and had them clear the errors. Almost certain I just had the codes cleared. No errors since.

Did mpg improve right away?