01GS430

I took my car to shop to repair an exhaust leak. Now, my o2 sensors in Bank 1 isn't working at all.

I am trying to find time but I don't have to time to find the best price on OE o2 sensors. The o2 sensors are original with 143k+ miles. Bank 2 o2 sensors are running fine. Should I replace all 4 or just replace these 2 on left bank?

WHich website have the best pricing. I used the search but didn't find that has my answer.

Other than that, it runs great. It is mainly highway car so it is important to get my lexus in perfect running condition for my brother to use and trips to anywhere for occasions.

GS4_Fiend

iTrader: (22)

You got Denso.com, Amazon or OEM from Swell. I highly recommend getting the ones from OEM. But it's your money.

FERNDOGGS3

i just replaced the one that its calling for i changed my bank 2 sensor to a few months ago

01GS430

from what i understand, Denso is the OEM part? is that correct? I am going to do this myself because i cannot see how this cost over 500 dollars for the service. I probably going to use this diy provided on the board. I will stick to oem parts for lexus because this car has been in family for a long time and probably the best car my father ever bought.

gs4 fiend, I am confused on a part about getting o2's from "swell". I haven't been on the board for a long time. I am always on m5board.com because i am looking to buy an m5.

GS4_Fiend

iTrader: (22)

Aftermarket Denso oxygen sensor sits higher than the OEM oxygen sensors when installed. Therefore, the readings are not gonna be accurate.

sam430

iTrader: (10)

check the wires first. The bank 1 sensor is very very difficult to unclip. The guy must of ripped one of the line. It's difficult to inspect also, you just have to run your fingers to each line to see if any is separated. Most of the guys who replaced their headers will get the CEL for bank one because this is usually what happens.

Gunnut

http://oxygensensors.com

RLGS300

Ngk is also a very good brand but then again oem denso can't be beat, it's all up to you

GSteg

iTrader: (15)

You should be fine with the Denso found on Amazon. It's a hell lot cheaper and I haven't seen any report of any changes in fuel economy/power/etc. Denso, NGK, OEM, they're all good. Of course buying one from the dealer will give you a piece of mind. Just don't go with Bosch.

Also, replace the ones that needs to be replaced. If all the other sensors are working fine (reading properly), then changing out to new ones won't do anything.

01GS430

Well, I had that exhaust leak for few months and logged over 7000 miles which it may affected the o2 sensor because of air going inside the exhaust and mess up the readings.