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.
Tuesday, March 13th, 2018 AT 1:28 PM