marktan

I've been chasing a P0410 code for almost a year now on my 2005 S600 and am getting really frustrated, so I figure I'll throw out what I have so far.

I've replaced the secondary air injection pump, the replacement turned out to be bad, so I replaced it again and verified it works (I can hear it activating, and I can trigger it via DAS).

Because it's turning on, I'm assuming it's not the relay panel (correct me if I'm incorrect with this assumption). I did, however, replace the HELA relay that plugs into the panel anyway, just in case.

If I reset the light, it drives for about 50-100miles, but when the CEL decides to come back on, it does it CONSISTENTLY when I come to a stop at a light (when the car stops and is at idle, I can hear the SAI pump turn on for a moment, then turn off, then the light comes on). I realize the pump shouldn't run all the time, it doesn't. I'm guessing it's activating and looking for a drop at the o2 sensors, which it must not see, hence the CEL turning back on. I've replaced the sensors anyway (no codes...but @ 100k miles, it can't hurt).

I've pulled the two saucer shaped valves off the car (front of engine where the hoses lead to). They were both coked with black soot on the inside, so I soaked in cleaner, wiped them off, made sure the plunger could move, and reinstalled. I'm wondering if these could be bad? I did look at the reeds, but was scared to touch them (I sprayed them with plastic safe cleaner but didn't physically manipulate them).

Cleared all the codes again yesterday, but today when driving to work, it popped back on at the McD's drive though window (same deal...could hear the pump turn on, then off, then the light).

Help, please. Thoughts? Thanks!!

benz_addict

Just get it turned off via STAR

shardul

iTrader: (1)

how do you turn off the secondary air injection system via STAR?

marktan

I've got STAR DAS/XENTRY, and I see where I can turn it off...I am afraid it will fail the Chicago yearly emissions test if I do (??)

shardul

iTrader: (1)

for sure it wont pass emissions

Where in DAS did you find this?

marktan

Without hooking it up to the car, I'll have to dig in the Xentry simulaton when I get home, but I do recall seeing an option for disabling the MIL as it pertains to the pump.
Off the top of my head, I think it was in Drive --> Motronic 2.7 -->adaptations or developer menu.
You can also send a signal to the unit under actuations to test it. Sorry I don't have more off hand.

Given my emissions test need, I have until March or April to figure this out.

marktan

Well I wanted to wait for several hundred miles to pass, and I'm happy to report that my P0410 (Secondary Air) problem has been resolved. The light has been on for almost a year and probably 10k miles, and I've been trying to diagnose the damn thing for months. What a pain in the *** to diagnose and remedy!!! There was nothing in DAS that helped to identify or solve the problem other than remotely activating the secondary air pump or being told to check voltage at the relay.

Here's the saga in a nutshell. FWIW, a lot of time (months) and miles (thousands) may bave passed between steps as I either didn't have time to mess with it, or I was so disgustingly pissed I refused to deal with it.

P0410 code triggered:
1) Replaced SAP relay ($25)...still no pump activation. CEL Code returned after ~100 miles.

2) Replaced Secondary air pump ($400)...code returned after ~50 miles.

3) Turns out the replacement pump was bad, so I replaced that again. Verified function via DAS this time. Code returned after ~30 miles.

4) removed and de-coked the two secondary air (saucer shaped) check valves and reed valves in front of the engine ($10 in carb cleaner). They were completely sealed shut with carbon. Checked valve function ($50 vacuum tool) while off the car. Good. reinstalled. Code returned after ~60 miles.

5) Checked the actual vacuum LINE from valve. No seal. Apparently the translucent white rigid-plastic vacuum tube had broken inside the black sheathing (probably when I moved it to replace my coil packs) so it wasn't visible that the line was broken. Replaced entire vacuum line ($12) between the check valves and the control valve solenoid thing (under the passenger side intercooler next to the turbo vacuum valve solenoid) with silicone vacuum tubing (couldn't find the original rigid line). Cleaned the little blue dime-sized check valve as well. Made it ~30 miles, and the light came back on.

6) Last ditch effort, I ordered and replaced the black vacuum control solenoid ($40) about two weeks ago. After 560 miles, no light!!

Thus ends this chapter. I just wanted to give others an idea of things to look at/for if you experience this as well.

tusabes

wow that sounds like a really frustrating problem, glad its fixed

MB-Dude

Good news, Marktan! I was intrigued by your problem as the P4010 error on my '05 S55 is uncannily similar. You discuss replacing the black solenoid, is that the one that activates the secondary air check valves? Just wanted to clarify.
Cheers,
Jeff

marktan

Yes...not sure where it's located on the S55 engine, but on mine it was passenger side, towards the rear of the engine bay, snapped onto the side of the valvecover just above my coilpack and under the intercooler. The vacuum line ran to the check valves. Link to Amazon here w/ the picture too. You may see a little dime sized checkvalve on the line close to it. (mine was blue, but it was covered in grime, so it wasn't obvious). Make sure it's functioning as well.

MB-Dude

Awesome, Marktan! Much appreciated.
Cheers,
Jeff

benz_addict

Glad it worked out, thnx for the informative posts!

eduardito

6) Last ditch effort, I ordered and replaced the black vacuum control solenoid ($40) about two weeks ago. After 560 miles, no light!!

Thus ends this chapter. I just wanted to give others an idea of things to look at/for if you experience this as well.[/QUOTE]

Marktan

Could you please tell me the part number or if you have a picture I have the same problem I'm in mexico and the local mercedes has no clue on what is the black vacuum control solenoid??

thanks

eduardito

Marktan

could you please tell me if is he part number 90?

SoCalSLKDude

Passed California Emissions Test with P0410 code!! Well, here's what I did: Reset the code, smog shop said the computer had 4 items that were "Not Ready." so I put about 50 miles on it, went back, and then 2 items were "Not Ready," but that's OK, you can pass with a maximum of 2 registers not ready (the car had not yet checked those systems). As soon as I got about 60 miles on it, CEL was back on, but Smog was DONE!!

I'm chasing the P0410 problem on my 99 SLK230 now, have replaced the EGR valve, check valve, vacuum hoses, oil separator, cleaned MAF, Air system, throttle body, big valve on the supercharger, and checked that solenoid valve, which seemed to work, but I don't know if vacuum is flowing/blocking as it should, so I will replace that next. I'll post what finally fixes mine (if anything ever does!!).

wallyp

I get the code now and then, but it usually clears on its own after three or four drives. I have replaced the vacuum actuators, checked lines, etc. One nice Spring day, I will try cleaning the air passages in the head with a piece of heavy, square weed cutter line.

SoCalSLKDude

That was the last thing we did - removed the pipe that the EGR check valve is attached to, that goes into the exhaust - and cleaned it out with a frayed SS wire cable chucked into a drill! No change for me.

amstel78

How did you remove the old vacuum line from the black plastic solenoid without damaging it? I see that the vacuum lines are crimped on with a metal band and I don't think there's a way to remove them without cutting the band off. Additionally, what size/type of vacuum tube did you purchase?

This photo is from my S65. I may have damaged the white rigid vacuum line when moving it out of the way to replace the coil pack. Below that is the vacuum line which goes to a T connector for the turbo solenoid.

DGCA

James,

Just did this over the weekend on my CL65. You do not remove the vacuum lines from the valve; the two valves are each attached in place to the silver metal 'stand' by a small clip on the black metal band holding the vacuum valve to the silver stand. Push the clip in slightly and the valve assembly slides off towards the front of the car.

dave

amstel78

Hey Dave, perhaps I wasn't very clear. And I when I posted my initial question, I didn't have the photo in front of me. I basically just want to know about removing the actual vacuum lines from the solenoid body. The body in particular is the topmost one off to the right. I'd like to replace the hard rigid white vacuum line that's sheathed in a black tube that goes into the top port of the solenoid. I have a feeling that got cracked when I was gently moving them around when replacing the coil pack. It could also have gotten pinched somehow when reassembling everything.

amstel78

Wally, did you ever sort this issue out? I've replaced the vacuum lines going out of Y32 Air pump switchover valve into both 126/1 and 126/2 air injection diverter valves. I also replaced Y32 switchover valve with a new one at some point. In addition, the air pump relay was switched and the air pump itself was tested to be working.

Only thing I can think of now is that there's an issue with 126/1 and 126/2 or that my O2 sensors are getting lazy and not registering the change in exhaust oxygen content fast enough once the pump kicks on.

In the interim, I end up clearing out the P0410 DTC with an OBD tool as having the CEL come on messes with my OCD..

Fried Chicken

Does anyone have a part number for me? I’m also getting this P0410 code and it’s annoying.

wallyp

I finally just used DAS to tell the ECU to not monitor the system - no longer get a MIL (check engine light), no code, no affect on emissions testing. The secondary air system is one of the things that make the W220 a very low emissions vehicle, which is lower than Federal standards require.

Fried Chicken

How did you do that?

wallyp

DAMIFINO - I've slept since then. I spent several hours on DAS exploring different ways to change what was active and what wasn't. I'm in the middle of a major move, so probably won't have time to go back in anytime soon - Sorry!