dvdchance

My car has been giving me a P0155 showing Bank 2 Sensor 1. It's a 2002 GS300.

Is the sensor in the pic correct?

What tools will make this easier to replace? Is their a specific socket that works best on these sensors?

Is the correct part Denso 234-4630?

Thanks for reading.

GeorgeG5

yeah, that's it (see attached diagram)

shops sell a special socket to use on these but I'm not sure you'll be able to get it there from top so I'd probably use an open wrench. To make it easier, soak it in WD40 or something couple hours before you remove it to make sure it's not stuck

dvdchance

Thanks for the reply George.

It looks like it might be more accessible to get a wrench on then I feared it would be. I'm probably going to get this socket: Looks like I can get better wrench placement using this then I would be just using the wrench right on the sensor.

Hopefully all will go well when I go to replace it.

wbmx1981

You should be fine with a wrench. Just soak it in PB Blaster a little before. Good luck.

Gdwrench35

I second the above notion. Use a 7/8 open end wrench and lots of PB blaster. Most of those O2 sensor sockets suck and they stretch and strip the sensor housing. The wrench works better. Especially if you rub a little valve lapping compound on the wrench. No slip!!

isfdude

iTrader: (11)

How to identify which bank to look for. You have to stand and look at the engine with the harmonic balancer facing you. Bank 1 will be on the left side and bank 2 will be on the right side.

bruceb58

You do realize he has a GS300 right?

isfdude

iTrader: (11)

On an inline 6 engine the bank 1 would be the closest to the front and bank 2 is toward the firewall. I forgot they use the inline 6 for these.

bruceb58

Why are you posting in the GS 2nd gen forum?

dvdchance

Well I got around to working on changing the sensor.

You both are very right that an open end wrench fits much better then the socket does. Frankly with the lack of clearance I couldn't use the ratchet if I wanted to.

But after about an hour of trying, it didn't budge not a bit. I used PB Blaster before and during my attempts. I'm hoping it will penetrate into the grooves a bit till I try again in a day or so. Should I keep spraying more or will what I've sprayed already start to work?

Gdwrench35

I would continue to spray it periodically and let it soak in each time. Keep in mind that stuff will burn if it gets hot enough.

Sometimes, taking the sensor out hot makes it easier. Run the car for a while until the engine is good and warm, then attempt removal if you can take the heat.

isfdude

iTrader: (11)

Because I had one 4 years ago and installed a supra 2JZ engine in it before it was wrecked.

GeorgeG5

as Gdwrench35 said, trying to loosen it with the engine warm may be a bit easire, but in this place, you'll probably get couple burns from the piping. Just make sure not to soak it just before the drive

Other stuff that works wonders at loosening seized threads is a brake fluid BUT it eats away paint

dvdchance

Thanks for all the wonderful suggestions and encouragement. Tried again an hour or so after my drive home from work, got it out and the new one in place. No more P0155 code.

Now to track down the P0430 that is appearing

GeorgeG5

if I'm not mistaken, that's the rear cat... try to check if there's any exhaust leak before it... that can mess up the reading too