Auto Parts and Repairs
Chevy Blazer
Check Engine Light
Chevy Blazer S-10

What do you replace on a Chevy Blazer when the check engine light code found was Secondary Air Injection System?


Top Answer
User Avatar
Wiki User
2015-07-14 14:59:09
2015-07-14 14:59:09

This is a pump that sits underneath your front bumper on the passenger side. It is about the size of a baseball and has two hoses going into it. I would suggest you replace it yourself as it would cost you about $360.00 if you were to go through the dealer. If you would like pics. of it you can feel free to e-mail me at I am going to be going to the dealer to see if there is some kind of re-call on these pumps seeing as how I am about to go on my fourth one and my truck is only a 2000 S-10 you out some.


AnswerWater intrusion is what will typically kill these electric pumps. There is a Technical service bulletin (#04-06-04-015) Regarding this problem, according to the tsb, you will need a new pump and there is a hose assy. #12590627) that has you reroute the pump from future water intrusion or it is gaurenteed to fail again.

I found this air pump and hose kit on Ebay.I did a search for S10 air pump.Great price on the new pump and they will ship the hose kit if you want order it.Fast shipping also.Total price for both pump and hose kit considerably less than a dealer. Although I have had water in the pump I did not see any indication of the inlet hose as the cause. It was suggested that the one way metal check valves ($15.00) that mount to the rt & lt exhaust manifold are worn and allow water from the exhaust to get sucked back into the pump. I first replaced the pump and within a week of dry weather driving the light came back on. I checked the pump and it was again full of water. I just replaced the valves which had deteriorated on the inside. So hopefully this will eliminate the problem. Note - The valves are impossible to remove without removing the 1/2 tubes (held on with 2 nuts) they are attached to the manifold with. The valve threads sieze to the tube thread and had to be clamped in a vise to remove - I actually had to hacksaw the valve section to get it off the pipe. Careful as not to damage the threads. Good Luck Vitaman


Thanks this is very helpful, just thought I might add something. I have had the same problem with water in the air pump on my 2000 Chevrolet Blazer 4.3 L V6. I went on eBay and searched for the pump like you had recommended and I found a pump for sale by seller:autopartsdirect2you ,any way the lifetime warranty offered by these guys is great. The problem is with water gettin ginto the air pumps, and the warranty covers it. Just thought I'd add that. I think a good warranty with this in particualr is very important


Related Questions

Replace the check valve on the secondary air injection system on the passenger side

The secondary air system pump is on the driver side below the battery .

There are several ways to fix the secondary air injection system in a 2005 Chevrolet trailblazer. The most common fix is; changing the air filter.

Need to know what your question is.

secondary fuel injection system -airpump ac

the secondary air injection system is the smog pump and valve. the valve is located on the exhaust manifold with 2 hoses leading to the smog pump which is located under the drivers side floor. it is electric.

the secondary air injection system on a 200 Chevy s10 is right by the radiator on the passenger side of the engine bay. if you look down there are 4 bolts bolting it to the frame of the vehicle.

i know that a secondary air injection is what is known as an air pump and the pump new is 180 dollars at Advanced Auot Parts. But before you replace it try checking the fuse for the pump next to the battery and see if it is blown it is only about 3 dollars. It is in a black box on the left side of the battery right against the passenger side panel.

Trouble code P0420 means: Secondary Air Injection System

Secondary Air Injection System Incorrect Flow.

p0412 on a 2000 Malibu is secondary air injection system valve A malfunction-

The secondary air injection system is used to heat you vehicle's catalytic converter to temperatures suitable for burning off harmful emission gases. It basically pumps oxygen into the exhaust pipe, which allows the converter to reach temperatures of 500+ degrees.

You can reset the 2002 Chevrolet blazer security system by removing the security system fuse. Keep the fuse out for 10 seconds and replace it to its original slot.

Without knowing what is wrong with the system there is no way to determine the cost.

po414==secondary air injection system valve A CKT short!! no such code as p4014.

Code P0412: Secondary Air Injection System Switching Valve A Circuit Malfunction.

PO491 Secondary Air Injection System Insufficient Flow (Bank 1)

Secondary Air Injection System Switching Valve A Circuit Malfunction

Secondary Air Injection System Incorrect Flow Detected

Click the link for info on PO410 Secondary Air Injection System Malfunction

The 95 models did not have the spider on them. It was a TBI / Throttle body injection system. If your engine is a vortec, Then no it can't be cleaned.

It is a secondary air injection system bypass/check valve for a 2006 Ford Focus.

Copyright ยฉ 2020 Multiply Media, LLC. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.