Questions on my isx 15_continued |
11-17-2022, (Subject: Questions on my isx 15_continued ) Post: #19 | |||
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RE: Hello everyone. Code 4691 help Check the pressure relief valve at the front of the fuel rail. It could be leaking past. User's Signature: 2015 389 Peterbilt. ISX 550 18speed 3.70 gears | |||
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