Multiple fault codes but no CEL

[06YarisRS]

Originally Posted by Neinris

Alright, so I've done some research and I think I've narrowed down the culprits.
Just dropped about $220 US on both O2 sensors and MAF sensor. All Denso parts from RockAuto, I consider it cheap since they're all OEM. I didn't want to just replace one O2 sensor, since they work in tandem and I'm sure the other one is probably going to fail soon. She has over 140k miles, and I hope to put another 100K or so.
Also, I have an exhaust leak from my axle back, I've jerry rigged the muffler a couple of months ago, but it's not holding up. I convince my wife that I can't pass emissions with a leaky exhaust, so she let me drop about $300, including shipping, on a new muffler, I didn't tell that it's a Tanabe Medallion Touring-S exhaust. Hope they all get here before the weekend. I'll scower the junkyard this weekend or the next for an evap canister, that's just too expensive to buy brand new.

Here's the link to the site where I bought the muffler, it's the cheapest I've found: https://sparktecmotorsports.com/i-30...hback.html?v=1

Congrats on the Tanabe. Beautiful piece of hardware. I looked at them before I bought my Megan. I only bought the Megan because I found one on eBay for $100.00. The Megan narrowed to 1.14" where the tip attached to the muffler body - far too restrictive for my 2ZR turbo, but probably perfect for a stock car. Any chance you could do me a favour and measure the diameter at the tip and muffler body connection? Tanabe says 50mm ID, but I wonder if that's all the way through. Right now I have a Walker turbo muffler on there and it's only aluminized. Down the road, I'd like a nice, mandrel bent, SS solution.

[Neinris]

Originally Posted by 06YarisRS

Congrats on the Tanabe. Beautiful piece of hardware. I looked at them before I bought my Megan. I only bought the Megan because I found one on eBay for $100.00. The Megan narrowed to 1.14" where the tip attached to the muffler body - far too restrictive for my 2ZR turbo, but probably perfect for a stock car. Any chance you could do me a favour and measure the diameter at the tip and muffler body connection? Tanabe says 50mm ID, but I wonder if that's all the way through. Right now I have a Walker turbo muffler on there and it's only aluminized. Down the road, I'd like a nice, mandrel bent, SS solution.

Sure thing! The diagram shows it narrows at the neck of the tip though. But I'll take measurements anyway and picture of the inside of the neck. I'm hoping it's good enough for NA 2ZR when I finally get mine in.
I'm supposed to get all the parts on Friday. Looks like I have a small project to do this weekend.

[06YarisRS]

Originally Posted by Neinris

Sure thing! The diagram shows it narrows at the neck of the tip though. But I'll take measurements anyway and picture of the inside of the neck. I'm hoping it's good enough for NA 2ZR when I finally get mine in.
I'm supposed to get all the parts on Friday. Looks like I have a small project to do this weekend.

All the parts on Friday for your o2 sensor/MAF work, or for your 2ZR swap?

Thanks for being willing to take the measurements. I bet it will come in handy for more folks considering the Tanabe.

Cheers,

Adam

[Neinris]

Originally Posted by 06YarisRS

All the parts on Friday for your o2 sensor/MAF work, or for your 2ZR swap?

Thanks for being willing to take the measurements. I bet it will come in handy for more folks considering the Tanabe.

Cheers,

Adam

The O2 sensors, MAF, and muffler...

The 2ZR swap will have to wait when I move back to Maryland, maybe this summer.
I'm glad to take measurements, I'd like to contribute as much as I can and give back to the community, which has given me a lot as far as knowledge and ideas.

[Neinris]

Ok, so I've replaced both my O2 sensors, and MAF sensor, but yet I still have faults... Sigh... I did discover when I was replacing the O2 sensor in the header that I have an exhaust leak between the header and midpipe flange. I replaced the doughnut gasket and the downstream O2 sensor when I had my car on the lift this morning. This story will roll into my other post.
Anyway, I forgot to bring the ODB II reader, so I checked for faults again when I got home, and the following faults popped up:

P0300, 0171, 0172, 0100, 101, 102, 103, 011B, 0335, 0420, 043E, 043F, 0441, 0451, 0455, 0456

When I deleted them the fault changed to the original ones:

P0300, 0171, 0172, 0037, 0038, 0100, 0101, 0102, 0103, 011B, 0136, 0137, 0141, 0335, 0420, 043E

I don't have a CEL, and the engine hesitation seems to have went away when I've fixed the exhaust leak. Not sure if the ODB II reader I'm using is just not deleting my faults completely. It's a cheapo $50 reader.

Not sure where to go next, maybe fuel and spark? I have been thinking of upgrading my fuel pump, it's probably getting tired, since another 08 Yaris owner that I met at a car meet had to get his replaced just recently. The upgrade will be covered in another thread.

Well, stay tuned I guess if you're interested to see if I'm even able to get rid of my fault codes.