If you are talking about sound that you hear from beneath the car around rear seat and it comes in 1-2 min after starting engine then this is absolutely normal.
This is the sound from evaporation canister solenoid valve. The clicking noise is part of normal operation after you start engine.
It was explained in Bulletin
No.: 08-06-04-008
Date: February 04, 2008
TECHNICAL
Subject:
Clicking Type Noise Heard Under Vehicle (Replace EVAP Canister Vent Solenoid Valve)
Condition
Some customers may comment on a clicking type noise coming from under the vehicle. Some may comment that there are always three clicks while others may refer to the noise as being three bangs.
Cause
The clicking or banging type noise may be caused by the cycling of the evaporative canister vent valve, when the valve is cycling there may be three clicks or bangs heard. The cycling of the valve is determined and controlled by the PCM.
Correction
Explain to the customer that the sound they are hearing is a normal function of the vehicle's evaporative emission system and that no repairs are needed. If the customer still feels the condition is not acceptable the canister vent solenoid valve can be replaced with P/N 15788844. This is a quieter operating valve.
Before replacing the valve, please advise the customer that this will only reduce the sound level (volume) of the valve and will not eliminate the sound completely.
