CLS63 - Error P3699
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Joined: Jul 2020
Posts: 12
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From: California
08' CLS 63 AMG
CLS63 - Error P3699
Recently, I got a check engine light on my '08 CLS63. Based on what most people were saying, I figured it might be the fuel rail pressure sensor, so I went ahead and replaced it. Cleared the code, and everything seemed fine, but the CEL came back the next day with the same code.
For reference, here’s what’s been done recently:
For reference, here’s what’s been done recently:
- Replaced the fuel pump about 3 years ago
- Had the PCV system done 2 years ago
- Throttle Body was upgraded to Aluminum
- Intake gaskets were replaced
- Swapped out all fuel injectors around a year and a half ago
- Haven’t driven the car much since early 2024
Last edited by 1ancelot; Jun 19, 2025 at 01:49 AM. Reason: Fomatting Fix
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