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

[Hard_Yaris]

OK... HELP please..

I am still getting the po420 code after replacing the sensor closest to the motor. Right away I noticed the increase in performance... then i tripped the code again...so

Do I have to replace the second sensor as well...? My car is at 160,000Km. original exhaust... what should I do to fix the code?

[Melloreel]

I can't help with the codes! But I did want to note that my first taste of sensor hell was with an 04 rav4. I was not aware of the term "disimilar metals" until then. All the lubricant in the world will not unweld the two metals hence stripped threads!
I was going to take it to dealer for repair, but being mr handy I chose to replace it myself. This is when the nightmare started. Spent hours trying to break sensor loose, then when I did it just spun in the hole. Long story short. Had to weld a threaded plug back in header. Asked dealer what he would have done if he stripped it? He said replace header, and charge me for it. Said it happens all the time? Oh! 900 to replace header. Why does'nt factory put never seize on?

[SignPirate]

I got 75000+ mi on my 07 hatch no wonder why the exhaust stinks. Guess ill be changing those out next oil change. Thanks auxmike for your VERY helpful post/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