Clicking sound under hood - possible timing chain
timing chain life span varies, it depends on what type of driving u do, for instance heavy on the throttle wears ythem out faster from the streaching this causes, but at 160,000 miles the noise u are hearing is likely a loose timing chain, replace it before it comes apart and damages the engine. This job is not for the home mechanic, it requires special tools and a high degree of skill and a factory service manual is a must.
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