lilianhoffmann30
S40 engine power loss
Summary of the thread
A 2003 Volvo S40 is experiencing engine power loss and a check engine light, leading to speculation about an air intake issue. The problem is identified as likely being a defective throttle valve, causing the car to enter limp mode and reduce fuel efficiency. The recommended solution is to have a workshop inspect and repair the throttle valve, which was confirmed as the issue and is being addressed.
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4 comment(s)
lilianhoffmann30 (community.author)
Limp mode, got it. Fuel efficiency has taken a hit, yeah. Could it be the throttle body itself, or something else entirely? How would I check it?
manfredtaylor1
Given the age and symptoms, it's likely the accelerator pedal module or the electronics inside are defective. I'd recommend having a workshop check it out; a faulty throttle valve can cause further issues. Repair cost should be around 265€.
lilianhoffmann30 (community.author)
Thanks! Sounds like I was on the wrong track. Took it to the shop, and you nailed it – throttle valve issue. They're fixing it now.
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VOLVO
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S40
manfredtaylor1
Sounds like it could be a defective throttle valve. Has the fuel efficiency dropped too? When the check engine light is on and power's reduced, the car's probably in limp mode to protect the engine.