Rxlexus350

I have a 2010 RX350 and when I went for an oil change, I also got a diagnostic because I had the (check engine, VSC and Trac off) lights on for awhile now.

So based on the diagnosis, they recommend replacing the manifold.


Quick question-the part # is 17140-0P150 for the manifold that needs replacement. Does Bank 1 or Bank 2 make any difference? And is it the driver side or passenger side?

Mesquite77

Edit, oops, bank 1, bad luck. That part no is the bank 1 exhaust manifold, and includes a built in cat, so is expensive, and is specific to bank 1. Hard to change, it is the one between motor and firewall/

Changing that is pretty unusual, what were the specific fault codes?

How many miles?

You can pull the A/F sensor and put a stalk camera down to look at the cat and see if it is clean and not damaged.

Roscol

That part # comes up as right side, which is Bank 1, between the engine and firewall. If it is, not so easy to change.

Rxlexus350

That’s what the diagnosis says. The car does have 226k though.

Mesquite77

I would be tempted to replace the O2 sensor first, both banks. There is a chance it may fix it, and is way cheaper. Even if it doesn't fix the DTC, they are at their end of life anyway, and are easy to replace. If you get a new manifold anyway, use your new O2 sensor(s) with it.

Clutchless

Get a second opinon from an independent repair shop, hopefully one that works on a lot of Toyotas. I would not trust the dealer on this expensive and very rare diagnosis, however if the catalytic converter is bad.....

Rxlexus350

If I was to replace the o2 sensors, how many are there? 2? 4? And does it have to be the Lexus brand or it doesn’t really matter?

salimshah

We need a bit more information.
Did anyone damage the manifold trying to pull out the sensor? I see no reason how it can go bad.

Salim

Rxlexus350

No sensors were replaced so I don’t think the manifold got touched. But if you see the pic I sent-the code says bank 1 and they said that it’s very rusty.

Clutchless

They are always very rusty. They are also very difficult to remove because of all the rust.
Use Google and Yelp to try and find an independent Japanese or Toyota specialist near to you.
If it ran okay even with the warning lights then I suspect your catalytic converter is okay and it may just be the 02 sensors. Dealer service writers work on commission and have a lot of incentive to oversell repairs that are not needed.

RX in NC

^^ What he said. Sounds like your dealership service writer was catfishing you in hopes of scoring a big bonus. Find a respectable long-time-in-business indie repair shop and get a second opinion.

salimshah

Shop needs to show you a crack or broken flanges or buggered up sensor hole. 98% of the time it is messed up sensor hole as some one tries to remove a ceased sensor. If you go to a good shop they are upfront and tell you the sensor replacement cost if it comes out easy or an inflated cost if the sensor is ceased. You can see lot more discussion on this in first gen RX.

Some cracks can we welded too.

Salim

Rxlexus350

Thank you all for your feedback! Definitely don’t want to waste money if the car doesn’t really need a new manifold especially that it’s costly.

Quick question- if I wanted to replace the o2 sensor, how many are there and if it says bank 1, which sensor is it?!

Thx.

Clutchless

A review of these older threads will help. At least one has a diagram of the O2 sensors etc.
https://www.clublexus.com/forums/rx-...nded-part.html
​​​​​​https://www.clublexus.com/forums/rx-...010-rx350.html
​​​​​​https://www.clublexus.com/forums/rx-...-location.html
​​​​​​https://www.clublexus.com/forums/rx-...en-sensor.html
​​​​​​https://www.clublexus.com/forums/rx-...nded-part.html

Mesquite77

The sensor before the cats are A/F Sensors, one each bank. The ones after the cat on each bank are O2 sensors, they are different than the A/F sensors. So 4 total, 2 of each type, and likely different part nos due to the length of the wires and connector locations.

The O2 sensors, after the cat, determine if the cat is working to spec. The A/F sensors before the cat provide a feed back loop to the engine ECU to adjust the Air Fuel mixture.