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S-Class (W220) 1999-2006: S 320 CDI, S 320, S430, S 500, S 600

Code: P20D4 And A Rough Idle

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Old Nov 7, 2022 | 08:59 PM
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S 430
Code: P20D4 And A Rough Idle
Quick question.
My 05 S430 sometimes has a slightly rough Idle/ vibration. Nothing crazy but enough to know something isn't right. Dont have any check engine lights or anything. When I went for state inspection I briefly asked my mechanic and he plugged in his scan tool which pulled this code (P20D4). The scan
tool recommends a mass airflow sensor and it checks out with the symptoms. Curious to know if anyone has any other ideas before I bite the bullet on a new MAS.


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Old Nov 8, 2022 | 03:08 AM
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CL 600 '00 5.8L V12
Have you ever replaced the camshaft and crankshaft position sensors?
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Old Nov 8, 2022 | 09:14 AM
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S 430
No, I have not.
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Old Nov 9, 2022 | 01:54 AM
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CL 600 '00 5.8L V12
Have you had cold start issues, where the car would crank for way longer than usual?
Or does the car stall when it's hot?
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