Emissions Check Help - P0430
08-08-2012, 04:52 PM
#1
2nd Gear Member
Thread Starter
Join Date: Sep 2006
Location: Johns Creek, GA
Posts: 400
Emissions Check Help - P0430
Recently reinstalled stock airbox and reflashed back to stock. The car won't pass otherwise. I've been running an MRT catted H for several years and it always passed fine after the airbox/tune swap.
I drove the car about 60 miles and went for the check (in GA, as usual). Usually that was enough to go through "readiness" and pass. It failed readiness, so I drove another fifty miles. The car just threw P0430 - Catalyst System Efficiency Below Threshold (Bank 2).
What's the deal are the cats toast, an O2 sensor bad or the harness possibly bad? It's never done this across multiple emission checks....
If 02, I assume its the one after the cat but how do I check to be sure it's the sensor?
The harness will be pretty obivous.
If is the cat, I'm looking at having to swap back to stock H pipe and cats to get it pass?
Got to tell you, the timing of this stinks!
I drove the car about 60 miles and went for the check (in GA, as usual). Usually that was enough to go through "readiness" and pass. It failed readiness, so I drove another fifty miles. The car just threw P0430 - Catalyst System Efficiency Below Threshold (Bank 2).
What's the deal are the cats toast, an O2 sensor bad or the harness possibly bad? It's never done this across multiple emission checks....
If 02, I assume its the one after the cat but how do I check to be sure it's the sensor?
The harness will be pretty obivous.
If is the cat, I'm looking at having to swap back to stock H pipe and cats to get it pass?
Got to tell you, the timing of this stinks!
08-10-2012, 06:27 AM
#6
2nd Gear Member
Thread Starter
Join Date: Sep 2006
Location: Johns Creek, GA
Posts: 400
Put a non fouler in...50 miles and no code yet. Will drive another 50 and hope there is no code and passes readiness. If it throws a code back to the stocker and thanks to mrt for 4 years and over $500...
08-11-2012, 01:08 AM
#7
5th Gear Member
Join Date: May 2007
Location: Central Texas
Posts: 2,388
One thing to keep in mind: to help avoid those rear codes just for inspection, do not drive more than 3 drive cycles, including the drive to getting the inspection. Unless you're getting the code come up right away, the pcm accumulates 'counts' over several driving cycles, and when those counts exceed a threshold, the code will be thrown. Now when you clear the codes (even if no codes are present), the count resets, as course so do all the readiness monitors. So what I do to pass is this:
- clear the codes, reseting the computer.
- take the car for a 10-15 minute drive, holding steady throttle at various speeds of 45, 55, and 65, for at least a minute each. You have to keep the throttle and rpms and speed steady.
- go home, let the car sit overnight
- the next day, drive to the inspection station, but making sure you get through another similar drive cycle on the way.
When I get there, the car is ready, and no P0430/p0420 codes are set nor pending (I check readiness before actually going in to the inspection).
High-flow cats can cause this to occur rather frequently. PITA. Non-foulers or moving the sensors more out of the exhaust stream lowers the 'counts' the pcm sees and prevents the codes.
- clear the codes, reseting the computer.
- take the car for a 10-15 minute drive, holding steady throttle at various speeds of 45, 55, and 65, for at least a minute each. You have to keep the throttle and rpms and speed steady.
- go home, let the car sit overnight
- the next day, drive to the inspection station, but making sure you get through another similar drive cycle on the way.
When I get there, the car is ready, and no P0430/p0420 codes are set nor pending (I check readiness before actually going in to the inspection).
High-flow cats can cause this to occur rather frequently. PITA. Non-foulers or moving the sensors more out of the exhaust stream lowers the 'counts' the pcm sees and prevents the codes.
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