P0431 is the same as 421, just on the other bank of the V6, so for both o2's the anti-fouler trick should work. the 401 code might need a new EGR valve or EGR solenoid, not 100% sure. Hope this helps some.
What up Homies. It's been a while seen I've posted on TGC. I'm still out here in the cut. The Galant is still riding. I'm about to hit 200,000 miles in about 3,000 miles. A/C isn't blowing cold air anymore, but that's not a issue with me.
I need some help. I ran a scan test on my car and have 3 codes.
1. P0431 Warm up Catalyst Efficiency Below Threshold Bank 2
2. P0421 Warm up Catalyst Efficiency Below Threshold Bank 1
3. P0401 Exhaust gas recirculation A Flow Insufficient Detected
I need to pass the smog test by the end of the month. I purchased 2 new 02 sensors and 2 spark plug anti-fouler. I have not installed yet.
To fix the p0421 code I was gonna try this.
http://www.club3g.com/forum/performa...t-5-bucks.html
I'm kind of stuck on fixing or getting around the other 2 codes. Any input or suggestions I would be grateful
Last edited by LosAngelesRider; 11-23-2013 at 05:38 PM
P0431 is the same as 421, just on the other bank of the V6, so for both o2's the anti-fouler trick should work. the 401 code might need a new EGR valve or EGR solenoid, not 100% sure. Hope this helps some.
-Greg
"I smashed up the grey one, bought me a red;
Every time we hit the parking lot we turn heads!"
-Pimp C, "International Players Anthem"
What's up Krazi. How you been? The dealer should of Fixed my Cat years ago when they did that recall. To bad I didn't find out about till like a year later and I was over the warranty. I refuse to deal with the dealers cus they get you when it comes to fixing your car. I was able to resolve it. So I'm good with that. Till the wheels fall off!
Update. I was able to get help and clear the codes and pass my smog. Learned a few things I didn't know.
In order for your car to pass the smog test in CA and NV after resetting your codes your car can only have 1 pending readiness monitors if it's 2001 and above. My car had 7 out of the 8 Readiness monitors active.
I had help with the anti-fouler trick. I added fouler to all 4 of my 02 sensors. Then cleaned out the EGR. That cleared out all my codes.
My check engine has not been off in 4 or 5 years.
After doing all of that only 6 of my readiness monitor were active. It turned out that there was something wrong with 1 of my 02. Got a used one at the junk yard off a old car and had to spice the wires on the 02 sensor. Ran it on the highway and I was good to go.
Last edited by LosAngelesRider; 11-29-2013 at 08:04 PM
Quick question. Is all still good with your 9g? I have the same 0421 0431 codes for the second time. was ur car running rich at all during that time?
Double07
A few days after we fixed the codes they came back. Not a big issue since my car is running great and my smog isn't due till Nov.
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