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Old 03-20-2006, 07:06 PM
Join Date: Dec 2005
Posts: 4
Default Air Bypass Valve

Can someone explain what the air bypass valve is for? What are the effects if it's not functioning properly?

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Old 03-20-2006, 08:54 PM
Join Date: Apr 2005
Posts: 521
Default RE: Air Bypass Valve

Some markets it adds extra air when cold from supercharger for emmissions.
Its main function is to act a a waste gate to help regulate required boost for driving condition.

Aussie SLK230 '98 R170
A200 W169 2006
Melbourne Oz
Projector hid's etc
18 x 8.5 and 9.5 Brabus reps.
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Old 03-28-2006, 01:14 PM
Join Date: Dec 2005
Posts: 4
Default RE: Air Bypass Valve

I need some help finding the real reason why my check engine light is on. I have a 2000 SLK 230.

The code reader at Auto Zone displayed a P0410 error (secondary air injection system failure) about one month ago. I read the suggestions on this forum about cleaning out the air check valves, but at the time, I thought there might be other problems. In the mornings when I would first start the car, it seemed sluggish, and it was often difficult to accelerate.

So, I took the car in and was told that two additional errors came up--P0243 (recirculated air flap actuator for supercharger) and P1235. I was told that the the air bypass valve needed to be replaced because the electronics weren't working properly.

After the new part was installed (and my spending money was gone), the check engine light stayed off for two days, but now it's back on. The Auto Zone code reader shows a P0410 error again. Do you have any suggestions about the cause of the problem? Should I go ahead and change the air check valves?

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Old 03-29-2006, 01:06 AM
Junior Member
Join Date: Mar 2006
Posts: 7
Default RE: Air Bypass Valve

I went to my AllDataFYI subscription service for information regarding the P0140 code.

A few of the possibilities are the (1) EGR valve malfunctioning, (2) air combi valve not working and/or (3) the airpump or supercharger not putting out a sufficient amount of air.

Hope this helps . . .
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Old 03-30-2006, 12:29 AM
Join Date: Feb 2005
Posts: 130
Default RE: Air Bypass Valve

DTB - P-B-07.61/15a DTB on P0410 Engine wiring harness
Joseph Doll
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