Hey gang,

I have a 2000 Toyota Tacoma, and live in Wisconsin. I can't believe how much these nuts rusted. I'm getting the "check engine" warning light, and it's a P0136 code. Any idea how to proceed?





Also, there's some rust underneath the O2 sensor mount. Could this be causing the problem?

 

Eek. Well I'd probably just get a new O2 sensor bung welded on there. I'd imagine most exhaust shops would be able to replace it for you. Or if you've got a welder, you could cut and replace.

 

If that part looks bad what does the rest of the exhaust system look like.

The exhaust leak could be the cause of the code or the sensor could be kaput as well.

If you can weld remove the pipe then get the sensor out at this point you should be able to make the call if you can repair this bung or need to replace with a new one and new sensor.

Not hard just a pain :jessica:

 

You might be able to save that bung but it will take some work. It would be better to buy a new one IF you can find one (Last time I checked Toyota didn't sell them). I made one from scratch and refurbished another one for the 2 I needed.

First I'd remove that sensor and gasket and see how pitted the gasket mating surface is. Those remnants of nuts will probably come off with a wire brush.

Pics of the ones I put on my exhaust.













The one on the right was cut out of an old pipe and refurbished. The one I made needs to welded in parallel with the pipe since its not curved to fit the pipe.

 

autozone has new studs, had to use new ones on mine, that bung looks toast though... I got another bung welded in for my AFR meter on mine for $45 at the shop that did my first tune, I'm sure a local shop would do it for even less. maybe time for new exhaust all the way back though...

 

The gasket is coming apart, but the bung may be okay. As previously stated.

I'd pull the O2 sensor out, and clean up the bung and threads of the studs to see what you have to work with.