Quote:
Originally Posted by RWD fun
The reflash was insanely easy. Now, after reading my ECU I see there's a PO420 code. I have 3 options...
1) New catalytic converter. Yeah, no.
2) O2 bung. I wonder if the smog technician will open the hood and inspect it. I haven't had a chance to really see where it is or if it would be obvious. Does have a picture of where exactly it's located?
3) Citric acid wash. I've done this before and it works incredibly well. Cat soup anyone?
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Do you have an aftermarket header? That's probably why the car is throwing code. I doubt the cat or the sensor has gone bad. I haven't seen many instances where that has been the case.
You won't pass a real smog visual with an aftermarket header. I recommend either buying a used one or borrowing one and swapping it.
The header itself on the FA20 engine has a catalytic converter, along with the front pipe. The only exhaust emissions sensor is located on the header; it's near the header-to-overpipe connection. In the area pictured below, you'll find a pair of twin connectors (one black and one gray); these are for the Heated O2 and AFR sensors on the header, respectively. P0420 deals with the black O2 sensor; follow the black sensor connector and wire down on the left side of the engine
