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2004 trailblazer , code po141 , new 02 sensors , whats going on ?

Code po141 on 2004 trailblazer , 02 sensors replaced , check valve from air pump new . air pump working . got rid of po410 code , now about 100 miles later have this po141 code for # 2 02sensor . could it be bad fuel? thanks. H.H.

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6ya6ya
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Posted on Jan 02, 2017

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rockfixya
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SOURCE: 2002 Chevy S10 4.3 02

problem is in replacement of O2 senser try again to put it.
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Posted on Jan 28, 2009

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Molson02536
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SOURCE: 2004 trailblazer,with po410 code.replaced purge

p0410 secondary air injection valve malfunction..
Just know that diagnosing this is time consuming since the "system" is only active for a few seconds on cold start.

for now:
1.) wait for your car to be "cold" or 4 hours. Disconnect the hose from check valve (located passenger side--the transmission dip stick is attached to the bolts that hold it to the block). Start the truck, you should hear a nasty sound for about 30 seconds to a minute. If you don't its your check valve.
1a.) If it is your check valve, you can try to clean it. Get some throttle body cleaner, remove the check valve spray thouroughly (I did it a couple of times to get all the carbon and rust out) and let dry reinstall and follow above instructions. If no go replace check valve

2.) wait for your car to be "cold" or 4 hours. remove the fattest hose from the underside of air intake hose (I think thats where it is, I have a CAI so Its hard to know where it is exactly OEM) and from the check valve. Have someone else start the truck. Feel the hoses, you should feel sucking and blowing (I can't remember which is supposed to blow / ****) If you don't feel anything then its the pump (maybe -- read further)
2a.) check fuses there are about 3 in the manual listed for air pump (if bad fuse replace and retest, make sure to check the fuses after to make sure that the pump isnt blowing fuses) 
2b.) Locate the air pump its driver side mid car just behind the cross member for the frame. There are two wiring harnesess one that goes into the relay (grey box) and one that has two fat wires (thats the power plug for the pump.) disconnect that one, wait for cold start and start truck while having a multimeter attached set on DC mode. If you get a reading of 0 then replace the relay. if you get power 12-15 volts replace the motor. 
3.) If both the check valve and the pump are testing out ok it could be a clogged hose.

There are only 3 parts to this system, Check Valve ($125), Air Pump ($280) and Relay ($50). parts4chevys.com has it listed as a check valve. $128 list. Good luck and hope this helps

Posted on Apr 08, 2009

  • 8 Answers

SOURCE: 2006 trailblazer po 411 code check engine light comes on and off over time is it a sensor or the air pump?

Check all your vacume lines one may have a crack in it

Posted on Apr 21, 2009

emissionwiz
  • 78919 Answers

SOURCE: I have a 2004 buick rainier and i,m getting a code po410

P0410 Secondary Air Injection System Malfunction
I am very familiar with this failure code, you are going to have to replace the secondary air injection pump, it has a failed motor in it, the code really indicates no airflow from the pump when commanded to be on.

Posted on May 28, 2009

ZJLimited
  • 17970 Answers

SOURCE: PO410 2004 chevy trailblazer replaced

The P0410 code refers to the emissions system. The AIR pump puts air to the exhaust to lower emissions. It takes in outside air and pumps it through two one-way check valves into each bank of the exhaust: P0410 - Secondary Air Injection System Malfunction.

About 90% of the time that this code is set, the one-way check valves have worn out or failed and allow water (which occurs naturally in the exhaust) back into the pump. In any cold climate, especially in climates with higher humidity, this water may be more excessive. The water partially fills the AIR pump, it can then freeze. When the PCM commands the pump on, if the pump is frozen it cannot turn, thus overloading the circuit and "popping" the fuse.

Causes: A code P0410 may mean that one or more of the following has happened:

  • Water may have collected in the AIR pump or the vent solenoid and frozen or corroded the pump
  • Blown AIR pump fuse due to freezing up

Possible Solutions: There is a technical service bulletin (TSB) regarding this code for a number of GM models. The TSB calls for the replacement of the AIR pump and the installation of a new secondary injection hose. The TSB can be found on this ACDelco site.
Additionally, if you simply replace the AIR pump the problem may return again (and again). If you replace the pump, also clean out the hoses and replace the one-way check valve. If this is on a GM model that the TSB applies to, follow those instructions in the link above. In a few cases, people have put a small hole in the rubber cover on the pump which allows any water to drain out.
Also, please note that this may be covered under the emissions warranty on the vehicle. If your vehicle is out of bumper-to-bumper warranty, check if the emissions warranty is still valid!
  • Replace the AIR pump AND one-way check valve
  • Test and clean the AIR pump AND test and replace the one-way air check valve
  • Replace the AIR pump inlet hose
  • Replace the AIR pump fuse (found under the hood)

Test it and tell us news.

Posted on Nov 04, 2010

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