02 sensor may be going.....anyone?

[marcus]

Been a while but yarisworld is always a good place for this ... I got 8 year old yaris and noticing big drop on mpg, don't matter if its summer or winter I normally get over 500 km before the last bar blinks now i get the last bar to blink on slight over 400 Kim's almost 100km I'm losing in a tank... I just got Toyota to clean my injectors hoping this will get my mpg back but didn't help , tire pressure is good , I don't think I'm dragging when it comes to rear parking brake, got 5w-20 running with new air filter.... So im left with 02 sensor.

I'm not getting a cel but is it possible to check 02 sensor if it's going bad..? Thanks guys...

[marcus]

Anyone know the denso part number for the O2 sensor?

[marcus]

Just for the record I found the par number for reference

Toyota 89465-52430
Denso part# 234-4069

In Canada it's about $150
Toyota sells them for $223 plus tax....

[Ryze268]

Anyone know the denso part number for the O2 sensor?

89467-52020

[marcus]

89467-52020

I believe ur right I need tHe upstream sensor air/fuel not the oxygen sensor.

Thanks

[Bluevitz-rs]

Yeah, the front one on a Yaris '06 up is an A/F sensor.

I just replaced my O2 sensor on my Echo because it was tested and was going bad and it did improve my millage.

[marcus]

Yeah, the front one on a Yaris '06 up is an A/F sensor.

I just replaced my O2 sensor on my Echo because it was tested and was going bad and it did improve my millage.

How much was it? I Haven't check the pricing on the air fuel sensor but it's definetely more than the O2 sensor...

[Bluevitz-rs]

Around $140 at parts source/Canadian tire. It was the same as OE too, just without a Toyota PN on it.


Sent from my iPod Touch

[marcus]

Around $140 at parts source/Canadian tire. It was the same as OE too, just without a Toyota PN on it.


Sent from my iPod Touch



Partsource sell ngk. Kinda prefer denso...

[Bluevitz-rs]

It's NTK. Not NGK. And NTK is what come from factory.

[woops]

NTK is the original part
go for it, will be cheaper too without the Toyota logo :)

[marcus]

I got one came in today from Toyota ..paid $170 and that's with employee discount..

[marcus]

It's NTK. Not NGK. And NTK is what come from factory.

This was already confirmed on the previous diy original is denso not ngk/ntk..

[Bluevitz-rs]

NTK was the OE part on my car.


Sent from my iPod Touch

[candy_jai]

hey marcus, did changing the AF sensor fix the low mpg? I'm having the same issue with my '07 and did exactly all that you done and only getting around 400-450km mixed city/hwy driving.

[marcus]

hey marcus, did changing the AF sensor fix the low mpg? I'm having the same issue with my '07 and did exactly all that you done and only getting around 400-450km mixed city/hwy driving.

Didn't have a chance to replace it due to cold weather..hopefully next week

[Bluevitz-rs]

Just for reference, I filled my tank for the first time with Costco gas because it was 0.10/L cheaper than the next closest station in my area. I got the WORST milage I've ever experienced out of it. 459km 37L fill. Last tank was Pioneer gas and got 600km out of 38L.

So all my driving being the same, Costco 8L/100km (29.2MPG US), Pioneer 6.3L/100km (37.1MPG US)
I knew Costco gas was watered down but holy crap!

[IllusionX]

Maybe your "Pioneer gas" probably have less ethanol than Costco. Although both should say they contain up to 10% ethanol.

I've never experienced differences over here. The only time I've had low mileage was with Ultramar gas.

[marcus]

Update... I actually cleaned the "maf " mass air flow sensor , didn't think it was that dirty since I cleaned it about 2 years ago but must have too much oil on my KN filter at one point but it's dirty and oily .. After cleaning it which took less than 5 minutes the next 2 tank shows my old mpg.. It's back.. Not the upper stream sensor after all..

I was getting 420km ave before the last bar blinks
After cleaning it's back to 520-530km before the last bar blinks

Roughly losing 100 km in a tank..