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Old 01-20-2015, 05:04 PM   #1
marcus
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02 sensor may be going.....anyone?

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...
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Old 01-20-2015, 06:05 PM   #2
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Anyone know the denso part number for the O2 sensor?
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Old 01-20-2015, 06:54 PM   #3
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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....
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Old 01-20-2015, 07:11 PM   #4
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Quote:
Originally Posted by marcus View Post
Anyone know the denso part number for the O2 sensor?
89467-52020
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Old 01-20-2015, 10:26 PM   #5
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Originally Posted by Ryze268 View Post
89467-52020
I believe ur right I need tHe upstream sensor air/fuel not the oxygen sensor.

Thanks
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Old 01-20-2015, 10:46 PM   #6
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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.
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Old 01-20-2015, 11:59 PM   #7
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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...
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Old 01-21-2015, 07:02 AM   #8
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Around $140 at parts source/Canadian tire. It was the same as OE too, just without a Toyota PN on it.


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Old 01-21-2015, 10:31 AM   #9
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Around $140 at parts source/Canadian tire. It was the same as OE too, just without a Toyota PN on it.


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Partsource sell ngk. Kinda prefer denso...
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Old 01-21-2015, 02:40 PM   #10
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It's NTK. Not NGK. And NTK is what come from factory.
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Old 01-23-2015, 12:18 AM   #11
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NTK is the original part
go for it, will be cheaper too without the Toyota logo :)
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Old 01-24-2015, 02:31 PM   #12
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I got one came in today from Toyota ..paid $170 and that's with employee discount..
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If my calculations are correct, when this baby hits eighty-eight miles per hour... you're gonna see some serious shit!!!!!!

"Horsepower is how fast you hit the object. Torque is how far you move that object.."
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Old 01-24-2015, 02:39 PM   #13
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Quote:
Originally Posted by Bluevitz-rs View Post
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..
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Old 02-01-2015, 11:58 PM   #14
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NTK was the OE part on my car.


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Old 02-10-2015, 05:32 PM   #15
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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.
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Old 03-13-2015, 05:32 PM   #16
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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
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If my calculations are correct, when this baby hits eighty-eight miles per hour... you're gonna see some serious shit!!!!!!

"Horsepower is how fast you hit the object. Torque is how far you move that object.."
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Old 03-13-2015, 05:42 PM   #17
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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!
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Old 03-13-2015, 05:58 PM   #18
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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.
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