Hi all,

2004 Octavia VRS estate, 87k on clock, stage 1 remap.

My engine management light came on on my way home from work last night. I called to my local garage this morning to see what is the fault code. He said it's the secondary air injection system, incorrect flow.

The car is booked in to the garage on Monday but I'd appreciate if any of you can shed any light on what the problem might be. My mechanic has seen it before but couldn't remember what the problem was the last time.

Edited 26 June, 201412 yr by Tedswagon

16795/P0411/001041 - Secondary Air Injection System: Incorrect Flow Detected

Possible Symptoms

• Malfunction Indicator Light (MIL) ON

Possible Causes

• Fuel Pump Relay (J17) faulty
• Hoses/Pipes to/between Components faulty/clogged
• Secondary Air Injection Pump (V101) faulty
• Secondary Air Injection Pump Relay (J299) faulty
• Secondary Air Injection Solenoid Valve (N112) faulty

Possible Solutions

• Check Fuel Pump Relay (J17)
• Check Hoses/Pipes to/between Components
  • Check Secondary Air Injection Hoses/Pipes for Carbonization
• Check Secondary Air Injection Pump (V101)
• Check Secondary Air Injection Pump Relay (J299)
• Check Secondary Air Injection Solenoid Valve (N112)

There are a few topics on this - the SAI pump rivets fail and it starts to split in two and leak. You can remove it and replace the rivets with small bolts to repair it.

Thanks for the quick replies. If it is the fuel pump relay would there be any difference to the engine running?

There is no obvious change to the way it is running.

As already stated the most common failure is the SAI pump housing rivets failing. With the car up on a ramp it's an easy fix, & took me about 40 mins to do.

http://uk-mkivs.net/topic/9315-step-by-step-guide-for-repairing-the-secondary-air-pump-with-pictures/

Cheers for all the responses. Will see how it goes.

Light was reset this morning and I've done 170 miles today with no sign of it, but booked into garage Monday anyway so will let you know.

Edited 26 June, 201412 yr by Tedswagon

You could have a look at this just to give you an idea of what is involved in troubleshooting this - http://www.youtube.com/watch?v=08flKdnIBQk

 

It may help,

 

Phil.

Hi all, thanks again for replies. Car has been fine since light was extinguished. Not that there was anything wrong before, so went into garage today and they didn't find anything. Guess I'll just have to wait and see.

Cheers.

Just to add I've done about 300 miles since resetting the light.

Edited 30 June, 201412 yr by Tedswagon

The pump is only active on startup anyway for a minute or so.  I wouldnt lose sleep over it!