How do you fix tappet noise on a peugoet partner van?

To fix tappet noise on a Peugeot Partner van, start by checking the engine oil level and quality, as low or dirty oil can cause insufficient lubrication. If the oil is fine, inspect the valve clearance and adjust it if necessary, as incorrect clearance can lead to noise. Additionally, consider replacing worn tappets or lifters, as they may not be functioning properly. If the noise persists, consulting a mechanic for a thorough diagnosis may be necessary.