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I have had a check engine light come on with the following codes:
0524 - The charge movement flap (cylinder bank 1) has a malfunction.
0810 - The air flow of the secondary air system (cylinder bank 1) is too low.
0814 - The air flow of the secondary air system (cylinder bank 2) is too low.
The check engine light only brings these codes up when it is a cold start. I then cleared the codes and it came back on the next cold start. I have since, replaced the intake manifold that comes with everything attached to it and cleared the codes once again. The next cold start, the code came back. I then replaced both air pump control valves and the secondary air pump itself and cleared the code again. On the next cold start, the check engine came back with the same exact codes for the fourth time. Check engine light comes on right about when the secondary air pump turns off after about a minute into the cold start. Tested all the actuators with a vacuum tester and seem to work fine. Can't figure out the problem, any help would be greatly appreciated. Thanks The codes in question
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Does the "Freeze frame" shed any more light on the issues? Does the "Service manual" help?
You should be able to do some active testing/actuation on the charge movement flap with the Autel scanner.
Also, your voltage seems kinda low at 11.83 Volts. Was the car running or do you have a battery charger attached? These cars get wonky when there is low voltage and could actually be the cause of your problems. And because you say it happens on "cold starts" (vs. warm starts when the battery may have a higher charge), you should really have the battery health checked. I know Costco does a stress health check on batteries they sell if you bring it in for problems. So, there may be an auto parts store that will do the same.
I have made a discovery that might have been the issue. The air pump change over valve which is a small valve controlled by the ecu is described as: This is the controller that opens the secondary air valves allowing the air being pumped to enter the exhaust ports in the heads which is used by the catalytic converters on cold starts to heat up much quicker thus reducing emissions. The issue I found is the vacuum hose between the small blue check valve and the air pump change over valve was broken at the "Y" junction. This would explain the codes for the secondary air injection being low since the EGR valves couldn't open completely on cold starts. I don't see how it would effect the charge flap code, but I also switched the tumble flap sensors at the rear of the intake manifold to see if the code changed from bank 1 to bank 2. I guess we will see tomorrow morning!
Not sure if i can link to other websites but when I searched around I came across someone with a W211 getting code 0524. Seems the fix was
"so, only thing I found might have been wrong was the solenoid on vac pipes seemed stuck, with only 8.8v from the car and being 11 years old may be it wasn't moving and a good 12v and actuating a good few times helped.
after 12 months of constant fault " (0524) short or open circuit in sensor lines / mechanical fault of one of the actuating lever / sensor faulty. replace sensor (P2005) " diagnostics saying no issue was ever there ? and it does appear to have a bit more top end grunt that I thought had gone walk about"
No idea what solenoid they are referring to. I just searched "0524 mercedes fault code" and found "w211 Intake manifold fault code...".
So I have replaced the intake, air pump control valves, the electric changeover solenoid (which is the last picture), all the vacuum lines, and the secondary air pump - all with OEM parts, and now getting the P0410 code on cold starts. Still cant find the issue.
Have you inspected the ports where those check valves bolt on to to see if they are clogged up? I was reading up on those check valves and how to clean them, some people had issues with the ports being full of carbon.
I was searching around for causes of that code and someone mentioned a faulty relay. Might be worth checking. I think the relay is under the hood on the drivers side near the brake fluid reservoir.
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