S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

1999 s420 p0410 Error

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Old 01-20-2018, 09:42 AM
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A couple of fast cars.
1999 s420 p0410 Error

Is this code for secondary air system or head gasket? Autozone read the code for me and the said head gasket, but google searches say secondary air system.

Car running rough, but gets a little better when warm. At idle the roughness is much less than when I put it in gear.

Please help.

Thanks!
Old 01-20-2018, 10:18 AM
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s320
its 2nd,same thing on mine,check plastic hard vac lines,they like to break.
Old 01-20-2018, 12:23 PM
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A couple of fast cars.
Originally Posted by oldsinner111
its 2nd,same thing on mine,check plastic hard vac lines,they like to break.
Thanks my friend!
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