Secondary air injection system, code P0411

I only have a regular code reader. Yes I cleaned the passages in the head and yes the pump runs when I start it. Like I said I changed the check valve and installed a new air pump and relay, the only thing I havn't tried is changing the hoses

All new parts.

Thanks Roy, actually the scan reader I have does read live data. I did go ahead and changed all fuses and relays that pertain to the secondary air system. The only thing I have not changed was the hoses.

Hi Roy,
We emailed each other a couple of weeks ago concerning my 2007 chevy trailblazer throwing a PO411 code. You told me that it is not a component issue. You feel it is a voltage issue. Well I took my trailblazer to three different auto mechanics and they all have checked my voltages and wiring etc. To say the least, all three service centers are completely stumped. Everything checks out fine. They all told me they do not know why it is still throwing the P0411 CODE. From all of their experiences they told me that changing the air filter, the secondary air injection check valve, the secondary air pump, the purge valve, and changing all fuses and relays along with all the voltage and connectors checking out, they find it hard to believe I'm still throwing the P0411 code. Since I spent more than $150 I qualified for an emissions waiver for a year. Do you have any more suggestions? The only other thing I have not changed were the hoses.
Thanks,
ROMANO PERRI

I'll have to check with them about the 02 sensors, the one mechanic told me his scanner was reading INC pertaining to the 02 sensor

Well one of the mechanics that looked at my trailblazer works for the chevy garage and he told me everything on his scanner said all the readings he was getting was fine so I don't know what to tell you

I'm just going by with what he was telling me, He did show me how he was commanding the pump on and said when he was doing it everything was reading what it should be reading, I was simply taking his word for it since he is a chevy mechanic and Im a construction worker. But yea I agree with you that they are missing something

Thanks Roy, I will do that, what changes exactly should I be lookin for just so I have something to go by when I'm talking to this guy

LEAN, got it, in the event it doesn't show lean what would be the solution?

Ok Roy thank you very much, I'll get on it

ROMANO PERRI