Ok, i just got this car, and obviously this code is stopping me from getting the car smogged. the dealer i bought it from has his mechanic on the problem.

We have figured out that the code is caused by the downstream O2 sensor, probably due to faulty catalytic converter.

So i have a couple questions:

1. Which side of the car is bank 2? Drivers? Passenger?

2. He replaced the catalytic converter on the passengers side, and after a few miles, the engine light popped back up with the same P0430 code. Did the correct cat get replaced?

3. If it was the correct cat, i guess the next course of action would be to replace the offending o2 sensor.

4. If that doesn't work, what else could be causing the issue here?

 

I have the same problem on a 99 Concord. Please advise

Sam

 

Just fixed my 04 Concorde Lxi - replace the downstream O2 sensor on the passenger side. Easy fix and you can get a Bosch sensor # 13138 from Amazon.com for $45 free shipping

good Luck!