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Hi,, i have csx 2007,, i can hear a whinning noise that goes louder when yoh step on gas.. the noise is more likely the sound of rc car,, i went to honda and they said the problem is tensioner pulley/ serpentine belt,, 450 dollars is the cost, includes 65 dollars diagnosis fee,, just worried if they have the right assessment about the problem,, need opinion,, thanks
 

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If the noise only changes with the speed of the engine and not the speed of the car then it could very well be the belt tensioner.

(auto tech here)

If you know nothing about cars, I cant know how experienced you are...so I cant recommend you do this.

What I do to locate a noisy tensioner/idler pulley is to place a stethoscope to the NON TURNING bearing part (i.e. the center mounting bolt) of the suspect tensioner/idler bearing.

They already have you for $65.
Try pricing the belt and tensioner at an aftermarket parts supplier.

These parts are much cheaper aftermarket than at the dealer.
Same goes for labor rates.
 
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