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I went to garage he checked no looses in exhaust and he said possibility on CVT.does CVT makes rattling noise? by the way car shudders in slow speed after accelerating
A CVT can make a grinding sound when the chain is on it's last legs. Judder will be most pronounced on a moderate to steep incline with light acceleration. Let off the gas at mid-hill, let the car coast momentarily down to 20~30 mph, then apply enough pedal to roll back up to speed. It should transition smoothly. If you feel any shuddering or surging, or the tach starts jumping around without pedal input, that's judder.

An ECU/TCM code readout is essential. P17F0 and P17F1 never turn on the MIL on any Nissan model. P17F0 is the CVT "death code", it means severe belt slippage was detected.
 
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