secondary air injection failure HELP

[mwyant]

I have a 1997 boxster and the service engine light is on when I ran the diagnostic it is displaying that its a secondary air injection failure cylinder 4-6 does anyone know what could be the cause of this. I replaced the mass air flow sensor and it already cleared up two oxygen codes. I have searched the forums and have viewed a great deal of secondary air total failure but nothing that displays the cylinder 4-6, is there something I am missing? could a tube be clogged or does the valve only work half way? I really appreciate your help and look foward to hearing from you.

thanks,

Mike

[berty987]

I have a 987 also fited with the secondary air pump. from what I understand of the system it is a pump that supplies additional air to the exhuast system to allow the cat to operate more effectively before it is fully warm. The system is only designed to run for the first few minutes of the car starting up this in turn reduces the emisions. From the comments you make it suggests that the oxygen sensors in one of the exhausts ( I beleive there is one upstream and one downstream of the main Cat on each branch) is giving a reading to suggest that the mixture is too rich. it could just be a simple case of the oxygen probe in one of the locations being faulty. Are you able to self check each probe ?

[mwyant]

I have a 987 also fited with the secondary air pump. from what I understand of the system it is a pump that supplies additional air to the exhuast system to allow the cat to operate more effectively before it is fully warm. The system is only designed to run for the first few minutes of the car starting up this in turn reduces the emisions. From the comments you make it suggests that the oxygen sensors in one of the exhausts ( I beleive there is one upstream and one downstream of the main Cat on each branch) is giving a reading to suggest that the mixture is too rich. it could just be a simple case of the oxygen probe in one of the locations being faulty. Are you able to self check each probe ?

Thank you for the info! I do have a multimeter to test However, I do not know what the normal parameters are for the sensors and what side the OBC is calling the fault on. The system states it is cyl. 4-6

thank you

[Loren]

P1411 Secondary Air Injection System - Signal Implausible (Cylinders 4 - 6)

Potential causes:

Secondary air injection pump does not work. - Relay

Air supply lines restricted. - DME control module

Electric change-over valve does not work. - Air supply lines

Air change-over valve does not work. - Secondary air injection pump

Vacuum system leaks. - Electric change-over valve

- Air change-over valve