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Re: our 2000 volvo s40 makes a howling/siren sound when...
Well if the engine came with the turbo than it is essential. It will cause a critical failure at some point if it goes unfixed. Could blow up. Could seize. There is alot of things that could go wrong from this issue if it goes unresolved and none of them are good
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My S40 T5 makes a whirring sound due to the turbo but.... I did have an issue with the right front hub bearing. Lots of road noise while driving and it got louder as I accelerated. $215 dollars for the part.
The S 40 came with different size and spec engines and they were not all Turbo charged versions. The choice of engines available depends on which country you are in.
The turbocharger is driven by the engine's exhaust system and runs continuously but has minimal affect at low engine RPM. Unless the turbo has failed, you should feel the turbo effect kick in when you accelerate hard but there will be a brief lag .
If you have the turbo engine fitted to your 2002 model S40 you will have a " 1.9T " badge on the rear of your car under the S40 badge. The "T" designates Turbo. An engine designator badge without a "T" indicates it is not turbocharged.
The turbochargers on these S40 models will fail (especially if the car has done a lot of miles) so you should have your car examined if you feel the turbo is not functioning.
I don't know the solution. My car a 2000 s40 just started having the same problem. It is now in the shop because the other night when I started the car the motor raced and would not slow down. After two try's of this, after the third time the car wouldn't start at all. After it sat overnight the car did start back up. Please post if you find a solution.
This is a common problem of Volvo S40. You can try this trick to turn off the flashing arrow light.
1) Turn off Engine
2) Turn key to "On" position (Not start the engine), you will see the panel light will on
3) Step on the break paddle
4) Shift the gear from "P" to "L" 10 times
5) Turn key to " Off" position
6) Now you can start the engine.
7) If doesn't work, you can repeat the procedure.
The best thing is to go to your local Volvo maintenance shop or Volvo experts to find out whats the problem..usually the coomon ones I think is the programs inside its ECU unit..you try this..ask the volvo experts to reset the ECU and lets see..if problem arise then it is no doubt you might need the sensor..hope this help..