I'm getting 2 P0420's, and 2 P0441's and a P0410.

P0420 - Inefficient Cat Bank 1
P0441 - EVAP Purge Fault
P0410 - Secondary Air Injection Malfunction

I THINK I fixed the EVAP one...not sure, I guess I have to wait for a few warm up cycles to know for sure. Now on the other ones...is there a common problem on LT1's where you could tell me EXACTLY whats wrong?

For the P0420 I'm gonna swap the rear O2's and see if that'll tell me if it's the cat or the O2. But what about the P0410? I did the intake fix not too long ago, could it be cause by not connecting the hoses back correctly?

Thanks for any help guys!

 

i think the catalytic(sp) converter is the problem it self to be honest. usually when the 02's start to fail you get get a code for the o2's them selves. Also if one failed then your car wouldnt go into closed loop. Do you have a scanner of some sort to look st your o2 readings?.

 

Not right now I don't. I've been using the one from Autozone to check codes. I think it has something that'll let me take readings from the sensors too...I'll have to check tomorrow.

 

Can anyone else help me? I scanned it again and the P0420 didn't come back. The other two are still there. I had a couple of vaccum lines that weren't connected to EVAP Canister Purge Solenoid Valve and the Vaccum Solenoid for the AIR system, I thought that would've fixed my problem, but I guess not.

Any other help? TIA!