S600 TT - the dreaded P0410 code (and the fix) - Mercedes-Benz Forum
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post #1 of 28 (permalink) Old 08-09-2017, 05:27 PM Thread Starter
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S600 TT - the dreaded P0410 code (and the fix)

Hi folks,

My '03 S600 was throwing a Check Engine Light. I didn't like seeing that because I prefer to keep my cars in good repair. Additionally, that's an automatic failure during the annual inspection, for those who live in areas where they do that (e. g. California).

I may not live in California anymore, but still, time to do something about this. I don't like broken stuff on my cars.

STAR Diagnostics showed a "current and stored" P0410 code, which refers to the Secondary Air Injection function chain. And what, pray-tell, is this "Secondary Air Injection"? Well, it's a hack that M-B did to try to make their emissions numbers look better when the engine's cold. It's an electric air pump that blows air into the exhaust, right before the catalytic converter, to try to heat up said converter sooner, so that it's more efficient sooner. It sounds just like a Dyson hand dryer, or a hyperactive vacuum cleaner, and it goes on for maybe 30 to 60 seconds. The M-B-specific code for this P0410 fault code is P2003.

STAR Diagnostics also showed codes P0443, P0444, and P0445 as a combined stored code. The M-B-specific code for that is P2026.

Clearing the Check Engine Light would work for maybe 20-50 miles. Then, it would come right back on, all nice 'n' yellow-orange. So, obviously this is a current problem that needs to be fixed.

I tried activating the pump via STAR. Yep, it came on, with that nice, loud whine. Dyson, beware! :-) So, clearly, the Secondary Air Pump was fine. Good thing, too, 'cause that thing's EXPENSIVE.

So, I next tried activating the Purge Control Valve from within STAR (this is component Y58/1 in the STAR diagram). When activated, it's supposed to click a lot. Sure enough, I could both see and feel it clickin' away like a cricket. Looks like that's working, too.

HOWEVER...I noticed something else as well!

When you activate the Secondary Air Pump, there are a couple of sensor voltages--I'm guessing the oxygen sensors--that were hanging around 700 to 800 millivolts (mv). They're supposed to go down to below 40 mv within 60 seconds. Well, THEY WEREN'T!! They were alternating between 93 mv and close to 800 mv, each one of 'em. That's not supposed to happen when this air pump is on. Since the pump's working just fine, then clearly either there's something wrong with *both* sensors...or perhaps there's something wrong with the Purge Control Valve that's supposed to activate when you turn on the Secondary Air Pump. Sure, it's a-clickin' like it's supposed to...but is it really working? Or is there a fault inside of it?

So, figuring one component will go out faster than two, I installed a new Purge Control Valve into this V-12 and tried STAR again. The part cost me $70 online, shipped.

LIKE MAGIC IT WAS....

The voltages are now reading 9 to 10 mv, both sensors, when the Secondary Air Pump gets activated. Turn it off, and it goes right back to 700 to 800 mv. The Check Engine Light does not turn on anymore. And I'm now being more enviro-greenie! :-)

I'd post the pics that I took, but my phone doesn't want to cooperate. If I can get it to cooperate, I will post the relevant pics.

The moral:

STAR Diagnostics is a Very Good Thing. It can usually tell you exactly what's wrong. If it can't do that, like in this case, it can point you in the right direction with a little bit of thought on your part. Who knows how much this would've cost me at even an independent shop, let alone the dealership?

When you wish upon a STAR...
Saving money, yes you are...!


.

2000 S430 (Dad's car, used for special occasions)
2000 S500 (wife's DD: my first W220 project car)
2003 S600 ("sex on wheels"--second w220 project car)
2003 S430 (one of two current DD's--third W220 project car)
2005 E320 CDI (the other current DD--first W211 project car)
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post #2 of 28 (permalink) Old 01-20-2019, 07:19 PM
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Here is how to rebuild auxiliary pump and check the relay, might help.

https://www.youtube.com/watch?v=tQ7Q...&frags=pl%2Cwn
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post #3 of 28 (permalink) Old 01-20-2019, 08:03 PM Thread Starter
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Someone bumped this thread to post a helpful YouTube video, and that helped jog my memory about getting the photos off of my cell phone. Turns out it was a bad cable causing the problems back then, not the phone. Here are the pics, for those who may run into this later.

In pictures IMG_1232.jpg and IMG_1233.jpg, you'll see the fluctuations of the sensors going between about 700 mv and about 94 mv. They shouldn't do that.

In photos IMG_1207 and IMG_1208, we see SDS giving us an idea where the problem likely is. It's not pinpointing it for sure in this case; a little bit of troubleshooting was in order. But SDS does get you in the ballpark so that you can troubleshoot it more easily.
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2000 S430 (Dad's car, used for special occasions)
2000 S500 (wife's DD: my first W220 project car)
2003 S600 ("sex on wheels"--second w220 project car)
2003 S430 (one of two current DD's--third W220 project car)
2005 E320 CDI (the other current DD--first W211 project car)
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post #4 of 28 (permalink) Old 01-20-2019, 08:33 PM Thread Starter
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And here's what it should look like when things are working properly.

Pic IMG_1253.jpg shows us what the test looks like in SDS. I managed to catch it mid-fluctuation, before replacing the Purge Control Valve. At this point, the right O2 sensor was fluctuating down, while the left O2 sensor was on its way up.
Pic IMG_1254.jpg shows us the end of the voltage swing, as you saw before. Again, this is before replacing the PCV.
Pic IMG_1253.jpg shows us *after* replacing the PCV. Note that when we turn on the Secondary Air Pump, the voltages go waaaay down to 5 and 10 mv. That's what it's supposed to look like, and that's what it *wasn't* doing before, hence the Check Engine Light.
Pic IMG_1253.jpg is just a close-up of the proper readings.
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2000 S430 (Dad's car, used for special occasions)
2000 S500 (wife's DD: my first W220 project car)
2003 S600 ("sex on wheels"--second w220 project car)
2003 S430 (one of two current DD's--third W220 project car)
2005 E320 CDI (the other current DD--first W211 project car)

Last edited by cowboyt; 01-20-2019 at 08:38 PM.
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post #5 of 28 (permalink) Old 01-21-2019, 08:25 AM
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put it to the stickies!!!
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post #6 of 28 (permalink) Old 01-30-2019, 10:10 AM Thread Starter
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Looks like that code, and the Check Engine Light (CEL), came back this month, i. e. a year and three months later. So, I put the car on SDS. Activated the Secondary Air Pump; that comes on just great. Also ran the PCV valve test shown above. The results aren't quite 5mv and 10mv anymore, more like 26mv (RHS) and 34mv (LHS) after 40 seconds. That's still better than 40mv in 60 sec, though, and thus within what SDS says is the spec. Cleared the codes and started driving again. A couple days later, the code and the CEL came back. But we're still within spec, though, when I run the test.

Any ideas?

2000 S430 (Dad's car, used for special occasions)
2000 S500 (wife's DD: my first W220 project car)
2003 S600 ("sex on wheels"--second w220 project car)
2003 S430 (one of two current DD's--third W220 project car)
2005 E320 CDI (the other current DD--first W211 project car)
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post #7 of 28 (permalink) Old 01-30-2019, 10:21 AM
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Hi T,

I'd change the LHS one, probably it is going over spec intermittently and popping the Code as @34 mV it is fairly close to the upper limit

HTH


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post #8 of 28 (permalink) Old 01-30-2019, 03:51 PM Thread Starter
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Apparently we've got two current part #'s for these oxygen sensors, and I could use some help here from the brain trust. They are as follows.

001-540-95-17
002-540-01-17

This is over at MBOemParts.com, at this link. Both part #'s are listed as item #16.

https://www.mboemparts.com/v-2003-me...ust-components

Looking at FCPEuro, I found that this Bosch part apparently is an older version of the top one.

https://www.fcpeuro.com/products/mer...osch-oem-16125

Its part # is 001-540-38-17.

I don't necessarily mind an older version of the correct part, as long as it's the correct part. But I would like to make sure I get the correct part. M-B sometimes has the same part (e. g. the front HVAC regulator/resistor in front of the blower fan) listed under different part numbers.

Anyone know which of these is the right one for the oxygen sensor on this car? It is a 2003 S600 TT, bone-stock, with the 5.5L M275 engine.

2000 S430 (Dad's car, used for special occasions)
2000 S500 (wife's DD: my first W220 project car)
2003 S600 ("sex on wheels"--second w220 project car)
2003 S430 (one of two current DD's--third W220 project car)
2005 E320 CDI (the other current DD--first W211 project car)
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post #9 of 28 (permalink) Old 01-31-2019, 12:31 AM
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@cowboyt ,

Hi,

CANCEL my above post, I misread your SDS Screens, had my head in a million other things last night, apologies.

It may not be a dying O2 Sensor, don't purchase yet

Fact is it could be that the A/F ratios are off on that bank, causing the 02 to read higher than normal !!

Maybe have a look at Vac Pipes for leaks, EGR Function, Misfire counters, fuel trims etc first ??

HTH,


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post #10 of 28 (permalink) Old 01-31-2019, 08:24 AM Thread Starter
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Yep, will do that first. Currently the temperature is -12 Celsius (10 deg. F), so when it gets a bit warmer (1 deg. C. will be sufficient), I'll check every hose that I can find. Thanks!
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2000 S430 (Dad's car, used for special occasions)
2000 S500 (wife's DD: my first W220 project car)
2003 S600 ("sex on wheels"--second w220 project car)
2003 S430 (one of two current DD's--third W220 project car)
2005 E320 CDI (the other current DD--first W211 project car)
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