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2003 Volvo S401.9T engine code P0299, Turbo Underboost and P0455

Help, Advice, Owners' Discussion and DIY Tutorials on S40 and V40. In this forum you'll find S40/V40-specific owners asking and answering questions on maintenance, ownership, repairs, tutorials and almost every do-it-yourself thing you can do to save money owning these Volvos.

1996 - 2004 S40
1996 - 2004 V40

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Joined: Thu Aug 09, 2018 4:23 pm
Year and Model: 2002 Volvo S40 1.9T
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2003 Volvo S401.9T engine code P0299, Turbo Underboost and P0455

Post by mountaincarjunkie » Mon Sep 23, 2019 4:45 pm

So I had my car in the shop for a bit and finally got it out and went out to town and then came back. I had a CEL before I took it in and after (and I should mention I took it in for mostly stuff unrelated to the CELs) I took it out. So I got this code.

P0299 Turbocharger underboost
P0455 Evap System Leak (large)

So things I can mention is that even though the turbo is underboosting, it still is creating boost. So I can't imagine the waste gate is faulty. The turbo also sucked down some coolant when I took it back to the shop after a T fitting in the coolant system peaced out. That's all I got. I appreciate any help and advice. Thanks!

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