DIY : changing the Oxygen / O2 sensor on Yaris hatch MANY PICS - Page 3 - Toyota Yaris Forums

Cigar_Maverick · 10-07-2016, 09:21 AM

Quote:

Originally Posted by 07liftback

Did mpg improve right away?

Unfortunately, that is hard to say... The weekend I put the new one in, I also switched to Mobil 1 synthetic Advanced Fuel Economy, put a new air filter in and new plugs. I had just bought the car and didn't know the maintenance history. The total gained me 2.5 MPG. Going from 37.5 to 40. I am led to believe that, in my situation, the new sensor has minimal effect. That having been said, as they say, your results may vary. In hindsight I might have done a more controlled experiment, but I just hammered it all out at once. Maybe somebody else can chime in who has more experience with just installing the new sensor.

MUSKOKA800 · 10-09-2016, 10:57 AM

Any gas mileage improvement found after replacing one or both sensors???

07liftback · 10-09-2016, 07:35 PM

Quote:

Originally Posted by MUSKOKA800

Any gas mileage improvement found after replacing one or both sensors???

Mileage improvement should only increase if replacing the oxygen sensor before the catalytic converter. The second oxygen sensor after the catalytic converter only tells the computer that the catalytic converter is still functioning but will not adjust air or fuel mixture.

That's why the first oxygen sensor is often referred to as the air fuel ratio sensor.

CB900F2 · 10-10-2016, 06:13 PM

Hey all..

I decided to check out my Air/Fuel sensor and based on the service manual inspection page(EC-18) From terminals 1>>2 it should read approx. 1.8 to 3.4ohms, mine read 2.8 ohms, but when I check terminals 1>>4 it should read approx. 10K or > ohms, but I read open.. No reading.. I am not throwing any engine code, so its seems odd to me..

Does anyone have a spare sensor they are also measure and see what you get on the 1>>4 terminals?..

I get about 490KM on approx. 38 liters of gas.. I drive pretty hard , and that's about 7.7L per 100KM.. which seems OK...

Any thoughts ?

Thanks guys!

CB900F2 · 10-13-2016, 06:05 AM

Anyone ?

Quote:

Originally Posted by CB900F2

Hey all..

I decided to check out my Air/Fuel sensor and based on the service manual inspection page(EC-18) From terminals 1>>2 it should read approx. 1.8 to 3.4ohms, mine read 2.8 ohms, but when I check terminals 1>>4 it should read approx. 10K or > ohms, but I read open.. No reading.. I am not throwing any engine code, so its seems odd to me..

Does anyone have a spare sensor they can also measure and see what you get on the 1>>4 terminals?..

I get about 490KM on approx. 38 liters of gas.. I drive pretty hard , and that's about 7.7L per 100KM.. which seems OK...

Any thoughts ?

Thanks guys!

zerosl · 10-29-2017, 08:29 AM

Darn, I got the p0031 error code as well after I replaced my donut gasket.

Did anyone confirm which sensor as corresponded to this code?

skuff33 · 06-23-2020, 05:03 PM

Quote:

Originally Posted by CB900F2

Anyone ?

Sorry to resurrect this thread but in the event it helps somebody I also got open readings on pins 1 and 4 for both sensors, new out if the box from denso.

2007yarishatch · 06-24-2020, 05:29 AM

I think I'll remove mine, clean it with a wire brush, and reinsert it

komichal · 06-26-2020, 12:04 AM

Just sharing my experience - recently I received error P0420 which indicates deteriorated catalytic converter. The light came back a few days after I erased the code. 2007 car with 172tkm (107t miles). I decided to change the O2 sensors as I learnt that they should be preventively changed in 160 tkm due to their laziness they build over time.

After the change the error is gone and the car is considerably more agile. Both Denso direct fit sensors together cost some 130 USD here. The upper one went out quickly while the one down the cat was a bit harder. Still - I used the WD40, a special nut, ratchet and a piece of pipe and it went off, even from a cold exhaust pipe. I was getting ready for some serious battle (even bought a torch for this) but in the end it was not necessary. Yay!

Btw I do not think that cleaning it with a wire brush is a good idea. The sensor is inside a metal cap, you can never reach it with the brush. And even if you do - you will destroy it.

fazil · 12-10-2024, 12:39 PM

i recently changed my 2006 Mk2 Yaris 13. Terra (120.000km) upper side oxygen sensor.

The engine light was on for the last 5 years and checked with the service, confirming it was faulty oxygen sensor. Toyota dealer asked around $300 for the change.

Then after tons of research i bought a matching Denso sensor (DOX0109) that was similar to the original one without the socket. It had bare wires and connectors inside. You need to cut the existing socket and swap it on to the new one. Even the wire colors are the same.
I put it and yes, it works perfectly.

It all cost around $45 Now the fuel consumption is as good as new. Like 1-2 litre/100km difference with the new one.

So take it as a spare if you find. You'll need it.
Also the car had emission problems, i hope it's also fixed. I'll see in the next inspection.

10-09-2016, 10:57 AM	#38
MUSKOKA800 Drives: Scion FRS RS2, ‘21 Crosstrek Join Date: Oct 2008 Location: Chatham, Ontario, Canada Posts: 1,729	Any gas mileage improvement found after replacing one or both sensors??? __________________ TRD Upgrades: 18" Wheels wrapped in 215/35/18 PZero's, Sportivo Shocks/Struts, Lowering Springs, Swaybar, Axle-Back Exhaust, Oil Cap, Rad Cap, Signage. Aftermarket Goodies: Piggies SS, K&N Drop-In, Blitz S/C, DC Header, NST Pulley) Toyota Options/Accessories: Sport Pedal Covers, Sport Shift Knob, Ipod Interface, Summer Mats, Winter Mats, Cruise Control, Auto-Dim Mirror, Echo steelies with winter boots.

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10-10-2016, 06:13 PM	#40
CB900F2 Drives: 08 Sedan Join Date: Oct 2008 Location: Toronto Posts: 301	Hey all.. I decided to check out my Air/Fuel sensor and based on the service manual inspection page(EC-18) From terminals 1>>2 it should read approx. 1.8 to 3.4ohms, mine read 2.8 ohms, but when I check terminals 1>>4 it should read approx. 10K or > ohms, but I read open.. No reading.. I am not throwing any engine code, so its seems odd to me.. Does anyone have a spare sensor they are also measure and see what you get on the 1>>4 terminals?.. I get about 490KM on approx. 38 liters of gas.. I drive pretty hard , and that's about 7.7L per 100KM.. which seems OK... Any thoughts ? Thanks guys!

10-29-2017, 08:29 AM	#42
zerosl Drives: 2008 Yaris S Hatchback Join Date: Oct 2017 Location: NY Posts: 29	Darn, I got the p0031 error code as well after I replaced my donut gasket. Did anyone confirm which sensor as corresponded to this code?

06-24-2020, 05:29 AM	#44
2007yarishatch Drives: 2007 yaris hatch back Join Date: Jun 2020 Location: dc area Posts: 5	I think I'll remove mine, clean it with a wire brush, and reinsert it

06-26-2020, 12:04 AM	#45
komichal View User's Garage Drives: Yaris 2007 1.3 2SZFE 64kW Join Date: May 2012 Location: CZ Posts: 339	Just sharing my experience - recently I received error P0420 which indicates deteriorated catalytic converter. The light came back a few days after I erased the code. 2007 car with 172tkm (107t miles). I decided to change the O2 sensors as I learnt that they should be preventively changed in 160 tkm due to their laziness they build over time. After the change the error is gone and the car is considerably more agile. Both Denso direct fit sensors together cost some 130 USD here. The upper one went out quickly while the one down the cat was a bit harder. Still - I used the WD40, a special nut, ratchet and a piece of pipe and it went off, even from a cold exhaust pipe. I was getting ready for some serious battle (even bought a torch for this) but in the end it was not necessary. Yay! Btw I do not think that cleaning it with a wire brush is a good idea. The sensor is inside a metal cap, you can never reach it with the brush. And even if you do - you will destroy it.

12-10-2024, 12:39 PM	#46
fazil Drives: Yaris 1.3 Terra Mk2 2006 Join Date: Dec 2015 Location: istanbul Posts: 6	i recently changed my 2006 Mk2 Yaris 13. Terra (120.000km) upper side oxygen sensor. The engine light was on for the last 5 years and checked with the service, confirming it was faulty oxygen sensor. Toyota dealer asked around $300 for the change. Then after tons of research i bought a matching Denso sensor (DOX0109) that was similar to the original one without the socket. It had bare wires and connectors inside. You need to cut the existing socket and swap it on to the new one. Even the wire colors are the same. I put it and yes, it works perfectly. It all cost around $45 Now the fuel consumption is as good as new. Like 1-2 litre/100km difference with the new one. So take it as a spare if you find. You'll need it. Also the car had emission problems, i hope it's also fixed. I'll see in the next inspection.