I have a 2001 SLK 230 Kompressor. The check engine light stays on. The code for this is P0410. Can any of you guys give me a step-by-step fix for this problem.
I'll look it up in the repair manuals. For now, I found this: (although for GM, OBDII codes are the same)
What does that mean?
The P0410 code refers to the emissions system. The AIR pump puts air to the exhaust to lower emissions. It takes in outside air and pumps it through two one-way check valves into each bank of the exhaust.
About 90% of the time that this code is set, the one-way check valves have worn out or failed and allow water (which occurs naturally in the exhaust) back into the pump. In any cold climate, especially in climates with higher humidity, this water may be more excessive. The water partially fills the AIR pump, it can then freeze. When the PCM commands the pump on, if the pump is frozen it cannot turn, thus overloading the circuit and "popping" the fuse.
Symptoms
Possibly symptoms include:
• MIL illumination obviously
• Hesitation on acceleration
• Noise from a bad/stuck AIR pump
Causes
A code P0410 may mean that one or more of the following has happened:
• Water may have collected in the AIR pump or the vent solenoid and frozen or corroded the pump
• Blown AIR pump fuse due to freezing up
Possible Solutions
Note: There is a technical service bulletin (TSB) regarding this code for a number of GM models. The TSB calls for the replacement of the AIR pump and the installation of a new secondary injection hose. The TSB can be found on this ACDelco site.
Additionally, if you simply replace the AIR pump the problem may return again (and again). If you replace the pump, also clean out the hoses and replace the one-way check valve. If this is on a GM model that the TSB applies to, follow those instructions in the link above. In a few cases, people have put a small hole in the rubber cover on the pump which allows any water to drain out.
Also, please note that this may be covered under the emissions warranty on the vehicle. If your vehicle is out of bumper-to-bumper warranty, check if the emissions warranty is still valid!
• Replace the AIR pump AND one-way check valve
• Test and clean the AIR pump AND test and replace the one-way air check valve
• Replace the AIR pump inlet hose
• Replace the AIR pump fuse (found under the hood)
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check the engine on the passenger side front.There are a couple of vacuum hoses coming from under the plastic front engine cover.Remove the cover and check the hoses,also the little canister check valve my be rusty inside.You may need to replace some brittle hoses.make sure you put the hoses back on the right way.I think this area is your emissions and will send codes.
For me the P0410 was caused by a corroded air pump check valve.
My original valve part # is 0021402860. That was replaced by a newer 0021406860.
I found an older check valve 0001407860 for $20. Tried it out for several weeks and the P0410 is gone for now. Let's see how it goes. If the older valve 0021406860 doesn't work, I will go for the newer 0021406860.
To remove the valve, you will need a 27mm or 1-1/16" low profile wrench.
Fix for Code PO410 - 2001 SLK 230 
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