P0421 converter or O2 sensor?

[slavrenz]

Excellent info. It looks like a bosch 15730 is a direct replacement. I think I'll pick one up while I track down new coil packs and wires.

Yes it is. I suppose if your O2 sensor has some age on it it is worth replacing first to see if that fixes things.

 

[slavrenz]

I don't like that part on your O2 sensor readings where the voltage appears to drop out completely (for both sensors)

 

[Mustang Matt]

I'm not completely sure what happened there. I think that might have been the first moment where I lifted my foot off the gas to let a car merge.

 

[Mustang Matt]

I got the sensor installed today. Easy swap. Bosch had an interesting splice kit. I was going to solder everything together but I ended up using their kit and it seemed like it did a decent job.

I took it for a spin around the block and I can absolutely tell it's running smoother.

I'll datalog it again on my drive in to work on Monday and see if it looks different.

 

[Mustang Matt]

Here's the data logs from today with the new o2 sensor. I tried to mimic the same conditions present when I logged the originals. Car is certainly running better.