Sorry to bother all of you but I’m having the Check Engine Light - P0410 code again. All was good for a couple months but the CEL and P0410 code is back. I am looking for ANY suggestions as to what to check or where to check.

Over the past year I have replaced the following in the Secondary Air Induction System … O2 sensors, right and left air valves, air pump, blue vacuum check valve, air induction system change-over valve, and the RCM has been rebuilt. I have not made any other changes to the vehicle.

On the first start after clearing the P0410 code I do not have Check Engine Light, after the first start I can get the Check Engine Light and the P0410 code right away or it may take several starts before it returns (as many as ten starts) … there does not seem to be a pattern to the Check Engine Light and the P0410 code returning.

Any ideas or suggestions as to what to check, where to check is greatly appreciated … I am lost at this point.

 

Quick search yielded these possibilities.
I notice catalytic converter is on the list. When they age, the interior breaks down and can plug the exhaust.

I had this happen on one of the uppers.
soliution for me was to remove all 4 of the converters. Here are a few causes that trigger the P0410 trouble code.

• Worn one-way check valve
• Blocked air injection system air intake
• Defective O2 sensor isn’t responding to changes quick enough
• Catalytic converter partially blocked because of exhaust backpressure increases
• Bad contact of air injection pump relay
• Blown air injection fuse

 

Try one of two things:

1) I'd bet money it's the RCM. Stop throwing all this money at it and order a new RCM and see what that gets you.
This will cost you around $150 and you can replace it yourself in a few minutes. Even if DJ did the "rebuild", you could have a sluggish relay or a bad solder connection, it happens.

2) Ignore the CEL. The secondary air injection does nothing but help heat up the CATS in order to make them work faster and better. It does not make the car run any better. Unless you are trying to pass an emissions test, you can ignore that code. Iknow it's annoying, cause with that light on you dont' know if its a 410 or some other, more important code.

 

Pizzaguy ... where is a good pace to order a new RCM ... I know I can get the part number off the unit I have ... Thanks

 

I got one a few days ago from Amazon. $150.

 

Thank you ... I have one on order

 

Hi there,
As a very new member, and previous sufferer of the P0410 code, I understand you pain.
I have rectified my light issue by bypassing the relay with an external diode protected relay that sits in the fuse box.
It can be troublesome getting parts down in rural Australia.
So I bypassed the weaker relay with a more robust type, and issue solved.
If you wish I can draw up a wiring diagram and some pictures to upload, most people should be able to fit one with out any bother.
Cheers
Old Breed.

 

A diagram would be nice if you don't mind ... I purchased a NEW RCM and have not had any issues as of yet ... but having a diagram in my back pocket counts as another option if the issue comes back ... Thank you

 

Just a quick note - do not obsess about the part number. Instead, order one for a "2005 Crossfire" or a "2003 SLK320" and you will be good.

I like PartsGeek for the RCM, they had the lowest price twice now (I've bought two, one for me, one for a car I was working on).

 

Thank you ... I got one from AutoHaus a couple weeks ago and have not had any more issues ... yet ... I used the part number on the OEM RCM and was able to find quickly

 

I've spent money at AutoHaus as well. Always been happy with them.

 

External relay wiring diagram for P0410 code rectification

Relay terminal connections;

“85”, connected to vehicle earth/ground, cut & join via wire, “1” on relay module plug ( this has 4 numbered pins)

“86”, switching/energising power ECU supplied, by wire,”3”, that you splice into.

“30”, is a new, inline fused, (40amp) power supply from battery. See picture.

“87”, cut wire “4” and join to make new power supply to secondary air pump,


This bypasses the existing relay for the air pump in the relay block. Diode protected relay is best practice to prevent possible back EMF from relay to ECU.



New relay sitting above fuse box , view from LHS. Note our vehicles are RHD.

New relay tucked in to fuse box looking from LHS of vehicle, note 40amp inline fuse

 

Thank you this, I will keep it for future reference