0430 Cel

[Topless]

Originally Posted by Jager

Topless,
I agree with you on what the trouble code indicates but I replaced all of my O2 sensors when I had 210,000 on my 2001 (bad AOS damaged them). Drove the car for about 2000 miles with no alarms, then got a P0430, P0410, and P1411 in memory with no CEL (I check the system occasionally with my Durametric). I ended up replacing my gas cap (way past due/real bad shape/original) then cleared the alarms and have not seen those trouble codes since. Was the P0430 alarm just coincidental? Did the bad gas cap create the P0430 alarm? BTW I have never replaced my catalytic convers, they are original.

Talking to one of the local mechanics they have had some success running a cleaner through the induction system that helps clean catalytic converters so your suggestion of adding some Techron to the fuel might do the trick.

A bad AOS can definitely foul your cats if you continue to drive the car due to excessive oil feeding the motor. Adding Techron might?? clear it up. A bad AOS will also cause mixture codes to come up (car will run lean). Since the OP said his AOS passed the "pull oil fill cap" test and had no mixture codes we can eliminate the AOS as a likely problem. A failed gas cap, bad AOS, intake air leak, and bad MAF will result in a CEL with mixture codes from the primary o2 sensors. Since the OP had no error codes from the primary o2 sensors we can eliminate these as a likely possibility. Just a basic process of elimination.

[ASpec818]

Here's an update. I got my durametric in today and checked for the fault codes. P1128 and P1130 codes popped up as well. They are: Oxygen sensing adaptation idle range bank 1 and Oxygen sensing adaptation idle range bank 2

I've been reading if these two codes pop up together it's likely it's the maf sensor?I hope I didn't screw anything up as I've cleaned the sensor recently. I'm not sure if the codes were there prior to cleaning, as the mechanic used a basic obd2 reader and only pulled the P0430 code.

The car also seems to run fine.

[Jager]

Glad to see you have a Durametric, now you can really get into troubleshooting the vehicle. I would clear the alarms and see if they come back in a few days, maybe you triggered them when you opened your oil fill cap doing the AOS test?

I've had those same alarms... They went away after I replaced my AOS (it was definitely bad) and then replaced all my O2 sensors (damaged from driving with a bad AOS too long).

I would take Topless suggestion of adding Techron additive to the fuel tank and taking it for a brisk drive.

[ASpec818]

As an update, the CEL has stayed off for about 70 miles now (I barely drive) and I passed smog today with flying colors. All I did was pour a bottle of techron cleaner, clean the maf sensor, and replace some leaking spark plug tubes. I'm wondering if the oil from my leaking spark plug tubes caused incorrect o2 sensor readings.

Also for some reason, even though my Durametrics still showed that the secondary air system was not ready, I didn't fail any functional tests during the smog check.