S90 Boost Pressure Sensor Issue

Hi, I'm having trouble with my 2023 Volvo S90 diesel with 159201 km. The check engine light came on, and I've noticed concerning symptoms. When accelerating, the car jerks, and there's a whistling noise that turns into a loud hissing sound under heavier acceleration. Sometimes, the engine even stalls at idle. Fuel consumption has definitely gone up, and the engine feels like it's lost power. Could this be a bad boost pressure sensor? I've checked the hoses connected to the intake manifold and can't see any boost leak signs, but I'm wondering if the sensor's cable or plug connection is defective? Any ideas before I start on the turbocharger?

4 comment(s)

Hey, that sounds familiar! I had similar symptoms on my S90 a while back – the whistling and hissing under acceleration, plus the loss of power. Did you notice it being worse when the engine was cold? I was convinced my turbo was failing, but have you checked the sensor itself? Is it oily or damaged?

Thanks for the quick reply! I haven't specifically checked if it's worse when the engine is cold, but I'll pay attention tomorrow morning. As for the sensor, I haven't pulled it out yet, but I visually inspected the plug and the surrounding area, and didn't see any oil or damage. Do you think it's worth removing the sensor to inspect it more closely, or am I wasting my time?

Honestly, based on what you're describing, and what I experienced, I'd say it's highly likely the sensor or its connection. Inspecting it is worth a shot, but if the symptoms are as pronounced as you say, you might want to just take it to a workshop. They'll be able to diagnose it properly and replace the sensor if needed. Could save you a headache.

Thanks a lot for the advice! I brought it in and you were spot on – it was the boost pressure sensor! The cable connection was defective. Repair cost was 95€, which I'm very happy about. Car's running great now!

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