4 times now......seriously?

[Cliff8928]

Are you sure the suspected faulty converters are "OBD II Certified" ? I know I made sure the one I picked up for C2's car was..

[Redog]

The high flow cats or ANYTHING that isn't GM will bring on the SES light for a 420 code.

The only 2 fixes are, the stock GM cat, or a O2 sim. O2 sims are around $50 and althought a bit tight to get your hand up there with the car on the ground it can be done.

Unplug the O2 sensor, cut the wire tie though the plug hook first, plug in the O2 sim.

On the ground it had the be done by feel. Go up from the driver's side of the car and be sure the car's exhaust is cold. You'll be right up on the pipe.

On a lift, 5 mintues, on the ground about 45 but I was a noob when I did it. Be careful your hand doesn't get stuck between the engine and firewall.

[Beholder88]

This is rather easy, cut off your cat, cut it open, romove the guts. Weld in a straight pipe, and get your PCM flashed with a downstream O2 sensor delete. No more codes, still pass inspection, and you're good to go. I've done it before and it's worth the little extra time.

[rowdygls]

Are you running headers ?

[AlexSchu02AleroV6]

Bam! Thats your problem its the high-flow cat... our damn 3400 engines are REALLY picky about their equipment. You need an OEM Cat because we have this stupid ODBII system with the 2 oxygen sensors

[NickAlero2000]

^lol, good summary ^
I'd go with the HP Tuners with the delete, ultimately cheaper and u can still run the highflow Cat.

[-Alero-]

sigh god damn it people

first i had straight pipe, 420 code comes up, finally get a magnaflow high flow cat had for over a year no problem

second the 420 code comes back, got another magnaflow

third the 420 code comes back, decide to go with a Catco cat not rated as a high flow

fourth the 420 code comes back infared temp scan the cat, replaced it with another catco

now then, light is on again, i could of sworn i already said this but I HAVE HAD A O2 SIMULATOR BEFORE AND EVREYTIME I PLUG IT IN I GET "BANK 1 TOO LEAN"

so i refuse to use it, no im not going with a OEM cat from the stealership for god knows what outrageous amount of money, there are countless people on this board who have a cat no where near a OEM spec/rate

im blaming seafoam, every bit of the way im blaming seafoam, it all makes sense now all those months where the car was fine and then i sea foam it and like a week or 2 later hello SES light......never using seafoam again i gaurentee its seafoam

[jackal2000]

maybe it was seafoam that caused it?

[-Alero-]

Originally Posted by jackal2000

maybe it was seafoam that caused it?

[jackal2000]

well maybe i can make it all better for you lol pm you in a minute...

[Redog]

Yeah I said something, but now, nevermind

[-Alero-]

oh jeez

[[ion] C2]

I said it already but... it's just a light. If it's not affecting performance, who cares?

[Midgear]

I cant even count how many cans of seafoam ive stuffed through my throttle body.. ive never had an SES light before- lol

[01OldsAleroGt]

actually.. when i punched out my car.. on the outside.. it looked like it was heating up.. i did have a 420 code.. but when i pulled all the crap outta the cat.. it didn't really look like it was clogged.. but who knows....i am gonna go and try the magnaflow OBD II high flow

[-Alero-]

Originally Posted by [ion] C2

I said it already but... it's just a light. If it's not affecting performance, who cares?

well personal prefernce i mean i dont like driving around with any idiot lights, and i mean if you have a current SES light on and then something else goes wrong by chance, its just gonna flash and beep, and i guess if you love seeing that SES light on you can be like "cool please stay there"

[Redog]

^^ ummmmm OK

I would only want the light to go away due to the inspection factor, automatic fail

[-Alero-]

personally i wouldnt want the light on period, ever to be honest...

but i mean if you have a problem with your car and want to get by in life by periodically hiding your SES light i mean go for it...

[[ion] C2]

HPTuners, disable the kitty code. It's a phenominal program..