Oxygen Sensor survey (1 Viewer)

[OregonLC]

In general my experience with mileage is the opposite. For 9 years I lived in Vegas which is relatively higher altitude (2-3k feet) and my LC always ran best with 89 octane. Now I'm at sea level, 89 octane still seems the best, but what was surprising is trying a full 91 octane tank of Shell gas, seeing my mileage drop from ~14mpg consistently to what is probably running closer to 11mpg. That's over a 20% drop!

For any opinions that O2 sensors just go bad over time, even without throwing a code, I find other opinions that say just wait until they actually go bad for real. But at this rate I could save the cost of O2 sensors in gas in just a couple months if I consistently got back a little mpg. Heck, the wasted gas in this tank alone at this rate will be $20.

The 87/92 thing has been kicked around here almost as much as tires. This is the first I've heard of 92 causing a hit. Not quite sure how that happens as the fuel energy is the same. The problem with the 87 is that the engine management can retard the timing in an effort to inhibit knock which comes at a price to economy.

There have been other posts here about mileage drop on the LC's being a precursor to O2 failure. The theory is that the sensor isn't out of spec yet still messes fuel trim long before it finally throws a code.

Lastly, to those who've used the Amazon Denso sensors... any feedback? Same performance as OEM? I know we discussed the non-OEM Denso units as not necessarily matching Toyota spec even with the same part number.

 

[saricbell]

I paid even more when I bought through my friendly Toyota dealership.

$57.19 and free shipping on Amazon... Denso is the OE supplier for Toyota.

Amazon.com: Denso 234-4169 Oxygen Sensor: Automotive

Sorry.. newbie question here. So my O2 sensor went over the weekend (Bank 2, Sensor 1) and I want to buy the sensor online using the Amazon link. Amazon gives you an option to check whether the part will fit your car. So of course I check and supposedly it doesn't fit a 2004 LC.

So is this definitely the right sensor? Just want to confirm before I order.

Thanks,
Eric

 

[petrotk40]

I would recommend using RockAuto Auto Parts. Rock auto says the correct Denso Part is 234-4138


Question... I replaced my front pass sensor after a CEL about 6 mo ago. In an attempt for some PM and better mpg, I replaced the driver sensor... Now my CEL is on throwing a code for Bank 1 Sensor 1... any ideas?

 

[hoser]

Eric, good catch. According to Denso's website:

98-02 Front Part# 234-4169, Rear Part # 234-4154
03-05 Front Part# 234-4138, Rear Part # 234-4154
06-07 have different PN's

 

[SupraTuRD]

At about 115k, I got a CEL for the bank 1/sensor 1. Replaced both left and right sensors (ahead of cats) with the Densos from Amazon... should be good for another 100k.

 

[Cannon88]

Thread bump! Lol. My bank 2 sensor 1 went out yesterday (error code P0155). Replacement on the way!

 

[etarasoff]

Another bump from the dead. Bank 2 Sensor 1 (right front) out for several months at approximately 120K on the ticker. Finally ordered a new Denso sensor from Amazon ($45 w/ Prime delivery). Install time was about 10 minutes.

 

[Spike555]

My right rear went south, i bought two brand new off ebay for $40, threw those in the front and moved the fronts to the rear.

 

[cwmoser]

I wonder if age has a bearing. Both left and right Sensor 1's replaced
on my 2002 LX470 - now with 39K miles.
Left at 25K miles, Right now she is 15 years old but with only 37K miles

 

[FJCowboy]

DTC P0155 Bank 2 Sensor 1
99 LC
205K Miles
I believe this the second time, but can't remember which one or when was the last one.