P0430 Code on 2000 Infiniti I30t

[maw1048]

Just recently, the Service Engine Soon light came on. I checked the code using OBD II Code Reader and the code was

P0430 - Catalyst System Efficiency Below Threshold (Bank 2).

I didn't clear the code. I went to Autozone, and they said that I probably need to replace the passenger side O2 Sensor.

The car is running fine. No problems what so ever. About a week later, the Sevice Engine Soon light goes off. So I thought I had some bad gas or something.

I continue to drive the car, and about a week later, the Service Engine Soon light comes back on. I check the code again, and it is P0430 again.

Should I change out the 02 Sensor, or is it probably something else? What course of action would you suggest to fix this problem.

The car recently passed emissions (about 3 months ago), so I don't really think my catalytic converter is bad......or is it?

Below are some details about the car. Any help or suggestions would be greatly appreciated.

Details of Car------------------------------Car: 2000 Infiniti I30tMileage: 98,600 milesLocation: Dallas, TexasMaintenance: Regular Oil Changes with Mobil 1, Always fill up with Super Unleaded Gas.

[maxnix]

O2 sensor probably failing. Best to replace both (only 2?) as the remaining one is well worn and not performing as a new one would. Keeping the feedback loop in balance should help the car run better.

And welcome to the NICO Club!

[maw1048]

Thanks for the response and the welcome.

Anyone else have any other thoughts on this?

Are the O2 sensors fairly easy to get to on this car? I've changed them out on other cars, but not this one.

[autotech43]

There is a concern regarding just replacing the O2 sensors, first thing you need to let a dealer use the consult II and perform some test monitoring the front and rear O2 sensors to determine whether the cats are doing there job. Second thing, there is a ECM (engine control module) update that MAY need to be performed if your vehicles ECM number falls into the category requiring the update. We have changed numerous sensors, front pipes that contain the cats and many updates to the ECM's on the 2000 and 2001 model I30's. Technician performing those tests need to be familiar with the Data they are looking at to perform an accurate diagnose and repair. The days of what we call technicians not testing and swagging parts at a vehicle just because of a particular trouble code are no longer relevant. Yes they might hit and miss on occasion, but with the higher cost of parts these days, I wouldn't recommend to anyone add a part and hope it cures the concern. Its your money, and why not get it diagnosed and repaired correct the first time, not to mention your peace of mind!

[Jeff Williams]

My 2000 I30t did this, at about 36,000 miles. The dealership said there was a TSB on it. They replaced both sensors, front & back, and re-programmed the ECU. Apparently the ECU tolerances were a little tight and giving the code and check engine light, or something like that, and the re-program fixed it. It was still under warranty, so no cost. I recall the ticket was around $300 to $400, though.

No drivability problems, and the car continued to get superb gas mileage.