O2 Sensors, P0430

[92LXAZ]

I know there are recent threads up but don't want to jump in on others. I've looked and I'm having trouble confirming...are all four O2 sensors on the 100 the same? I'm getting a P0430 code now out of the blue after my fuel pump replacement. The 80 has different ones for upstream and downstream. My downstream sensors are only about 7 months old so I want to do the manifold ones as a start to try to take care of the code.

It still runs fine so I'm pretty sure it is not the cats. So if having new sensors all around doesn't work I'll be stumped.

 

[Spike555]

Yes, on the 100 all four are the same.

 

[92LXAZ]

Awesome thanks @Spike555

 

[Julian Stead]

The fault code relates to the downstream sensors, they read CAT efficiency. You could swap the downstream sensors left to right to see if fault moves. Check for any exhaust leaks also, you can tap the CATS to see if you can hear them broken up, and remove CATS to see if they are blocked.

The fix for this is normally either the sensor or CAT, I wouldn't waste money on the upstream sensors as it would be a different code, if you have a code reader that can check parameters you could read the fuel trims and downstream oxy sensor voltages to help confirm your issue.

 

[92LXAZ]

That's what I've found, code for downstream. Just hoping it wasn't the cats. I did swap in a new sensor I had as an extra on the PS and the code is still there. I also swapped the one I had just taken out from the PS and put in on DS and code is still present. I do have an OBDII reader and use Torque app. Which side is this code for? Thanks @Julian Stead

To add to the sensor part question Amazon lists this one for the upstream, and is much more expensive. Not relevant to my problem now but still brings back the question of all four being the same part.

https://www.amazon.com/Denso-234-9051-Fuel-Ratio-Sensor/dp/B0018JUJ9O

 

[Julian Stead]

The sensors are different, only difference is the lead length though. It is the passenger(bank 2) side I believe.